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| Wire Number | Circuit Description |
| 1 | Generator field circuit (main feed) |
| 2 | Generator armature circuit (main positive line) |
| 3 | Generator ground circuit |
| 4 | Generator regulator to ammeter or shunt |
| 5 | Ammeter or shunt to starter terminal block or battery connection |
| 6 | Battery to starter |
| 7 | Battery ground including master switch if in this circuit |
| 8 | Shunt to ammeter positive |
| 9 | Shunt to ammeter negative |
| 10 | Ammeter or shunt feed to instrument panel circuit breakers |
| 11 | Ignition switch feed or magneto ground (LH) |
| 12 | Ignition switch to ignition coil or booster switch to booster coil |
| 13 | Magneto ground (RH) |
| 14 | Starter switch circuit (including feed) to relay or solonoid |
| 15 | Main light switch feed |
| 16 | Light switch (HT) to service headlamp or dimmer switch |
| 17 | Dimmer switch to high beam service lamps |
| 18 | Dimmer switch to low beam service lamps |
| 19 | Light switch (BOD) to blackout driving lamp including resistor |
| 20 | Light switch (BHT) to blackout marker lamps |
| 21 | Light switch (HT) to service tail lamp |
| 22 | Light switch (S) to service stop lamp |
| 22-460 | Turn signal switch to right rear stop lamp |
| 22-461 | Turn signal switch to left rear stop lamp |
| 23 | Light switch (BS) to blackout stop lamp |
| 24 | Light switch (BHT) to blackout tail lamp |
| 25 | Horn switch (including feed) to horn or horn relay |
| 26 | Horn relay feed and horn relay to horn |
| 27 | Instruments feed (instruments with polarity) |
| 28 | Fuel indicator to sending unit if single tank, or left upper tank indicator to selector switch |
| 29 | Fuel selector switch to right upper tank |
| 30 | Fuel selector switch to left lower tank |
| 31 | Fuel selector switch to right lower tank |
| 32 | Oil level sending unit to indicator or selector switch |
| 33 | Water and oil temperature indicator to sending unit |
| 34 | Low engine oil pressure warning light circuit, including feed |
| 35 | High water temperature warning light circuit, including feed |
| 36 | Oil pressure indicator to sending unit |
| 37 | Outlet socket |
| 38 | Dome light circuit, including breaker and switch |
| 39 | Map light circuit |
| 40 | Instrument light circuit |
| 41 | Interphone #1 |
| 42 | Interphone #2 |
| 43 | Interphone #3 |
| 44 | Interphone #4 |
| 45 | Interphone #5 |
| 46 | 12 Volt radio circuit, including radio master switch |
| 47 | Slip ring feed |
| 48 | 24 volt radio feed |
| 49 | Receptacle, aux power outlet, positive lead |
| 50 | Receptacle, aux power outlet, negative lead |
| 51 | Interphone #7 |
| 52 | 6 volt tap on tail light dropping resistor to tail light |
| 53 | Electric brake control circuit |
| 54 | Fuel cut-off circuit |
| 55 | Flame primer low tension circuit |
| 56 | Flame primer high tension circuit |
| 57 | Instrument panel ground |
| 58 | Compass light circuit |
| 59 | Hull ventilating fan circuit |
| 60 | Interphone #6 (extra) |
| 61 | Auxiliary generator field |
| 62 | Auxiliary generator armature (positive line) |
| 63 | Auxiliary generator ground |
| 64 | Auxiliary generator regulator to battery, including heater transfer switch |
| 65 | Auxiliary generator starter relay circuit, including switch and feed |
| 66 | Auxiliary generator starter to transfer switch, including starter or relay |
| 67 | Emergency stop switch ground |
| 68 | Battery interconnecting cables |
| 69 | Resistor to ground terminal on trailer coupling |
| 70 | Regulator ground (LH) |
| 71 | Windshield wiper circuit |
| 72 | Low transmission oil pressure indicator circuit, with feed (LH) |
| 73 | Radio terminal box to ground |
| 74 | Starter solonoid circuit (actuating) including switch or relay |
| 75 | Stop switch circuit (SW to SS on main light switch) |
| 76 | Fuel pump control feed |
| 77 | Fuel pump switch to fuel pump left |
| 77B | Fuel pump safety cut-out switch (??) |
| 78 | Fuel pump switch to fuel pump right |
| 79 | Fuel tank ground |
| 80 | Ignition coil to distributor |
| 81 | Battery positive feed to starting motor terminal block, including master switch |
| 82 | Starter motor terminal block to starter motor, left |
| 83 | Main light switch (TT) to tail light connection on trailer receptacle |
| 84 | Main light switch (SS) to stop light connection on trailer receptacle |
| 85 | Low air pressure indicator light |
| 86 | Ground on series parallel switch, to ammeter, including circuit breaker |
| 87 | Spotlight circuit for trucks and wreckers |
| 88 | Winch torque limited control |
| 89 | Automatic choke |
| 90 | Trailer receptacle to ground |
| 91 | Headlamp to ground |
| 92 | Parking lamp to ground |
| 93 | Starter relay grounding circuit |
| 94 | Starter relay auxiliary grounding circuit |
| 95 | Tail lamp to ground |
| 96 | Speedometer sending unit feed |
| 97 | Tachometer sending unit feed |
| 98 | Interphone #8 |
| 99 | Interphone #9 |
| 100 | Turret feed |
| 101 | Impulse relay feed (L terminal on impulse relay) |
| 102 | Large cal. gun firing solenoid to impulse relay (S terminal) |
| 103 | Small cal. gun firing solenoid to firing switch |
| 104 | Traverse motor feed |
| 105 | Recoil circuit on gyro control, through recoil switch |
| 106 | Gyro control (#3 on an connector) to motor stabilizer control, yellow post |
| 107 | Gyro control (#1 on an connector) to motor stabilizer control, green post |
| 108 | Stiffness circuit including disengage switch |
| 109 | Gyro stab. switch feed including circuit breaker and switch to gyro motor or anti-backlash switch |
| 110 | Gun firing and lights, circuit breaker feed |
| 111 | Gun firing switch, feed from circuit breaker including safety switch |
| 112 | Gun firing safety switch indicator light |
| 113 | Firing switch to large gun firing solenoid or impulse relay (F terminal) |
| 114 | Gyro control resistors feed |
| 115 | Firing relay feed |
| 116 | Gyro indicator light feed |
| 117 | Positive lead to gun firing switches |
| 119 | Normally open side of anti-backlash switch, to circuit #107 |
| 120 | Normally closed side of anti-backlash switch to gyro control resistors feed |
| 121 | Junction of circuits #114 and 120 to gyro motor feed |
| 122 | Firing switch to loaders safety relay |
| 123 | Loaders safety relay to shell primer |
| 124 | Firing switches to selector switch |
| 125 | Feed to loaders trip button |
| 126 | Loaders trip button to feed on test relay |
| 127 | Test relay to loaders safety relay coil |
| 128 | Loaders trip button through loaders setting button to controlled side of test relay |
| 129 | Loaders ready to fire indicator circuit |
| 130 | 6.5 inch selector light |
| 132 | Ammunition hoist circuit |
| 133 | Parallel disconnect circuit |
| 137 | Outlet socket |
| 138 | Dome lamp, spot light and reel circuit |
| 141 | Interphone #1 |
| 142 | Interphone #2 |
| 143 | Interphone #3 |
| 144 | Interphone #4 |
| 145 | Interphone #5 |
| 146 | 12 Volt radio circuit |
| 147 | Light for periscope and sighting devices |
| 148 | 24 Volt radio feed |
| 149 | Commanders master control circuit |
| 151 | Interphone #7 |
| 152 | Commanders master control circuit feed |
| 154 | Rammer motor control circuit, including switch and indicator |
| 155 | Elevating motor feed through circuit breaker and main switch and indicator ligh |
| 156 | Brake solenoid feed through brake relay |
| 157 | Elevating lead from reversing relay to elevating depressing motor |
| 158 | Depressing lead from reversing relay to delevating depressing motor |
| 159 | Turret vent fan |
| 160 | Interphone #6 (extra when used) |
| 161 | Feed for elevating and depressing control mechanism through circuit breaker |
| 162 | Elevating relay control through control switch and limit switch |
| 163 | Depressing relay control through control switch and limit switch |
| 164 | Brake relay control through brake switch and ground |
| 165 | Elevating and depressing relay mechanism to ground |
| 166 | Automatic elevation control through resistor and limit switch |
| 167 | Automatic depressing control through resistor and limit switch |
| 168 | Equilibrator motor feed including switch and indicator light |
| 169 | Gun, How. firing area control circuit |
| 173 | Radio terminal box to ground |
| 174 | Rammer control circuit |
| 198 | Interphone #8 |
| 199 | Interphone #9 |
| 201 | Generator field circuit |
| 202 | Generator armature circuit |
| 203 | Generator ground circuit |
| 204 | Generator regulator to ammeter or shunt |
| 211 | Right hand ignition switch feed |
| 212 | Right hand ignition switch RH coil |
| 214 | Starter switch or relay feed circuit |
| 233 | Temperature gauge to sending unit |
| 234 | Oil pressure pilot light |
| 235 | Water temperature pilot light |
| 236 | Oil pressure gauge to sending unit |
| 255 | Flame primer low tension circuit |
| 256 | Flame primer high tension circuit |
| 267 | Emergency stop switch |
| 270 | Regulator ground right hand |
| 272 | Transmission oil pressure pilot circuit light |
| 274 | Starter solenoid circuit right |
| 280 | Ignition coil to distributor |
| 282 | Starter motor feed right hand |
| 293 | Starter relay grounding circuit |
| 294 | Starter relay auxiliary grounding circuit |
| 300 | Air pressure gauge to sending unit |
| 301 | Ignition switch to throttle solenoid through feed terminal in terminal box |
| 302 | Throttle solenoid to throttle out switch (H) |
| 303 | Throttle out switch to brake throttle switch (A) |
| 304 | Feed terminal in terminal box to feed on clutch switch (D) and normal range switch (E) |
| 305 | Normal range switch to low range (F) and high switches (G) |
| 306 | High range switch on low/high range shift to switch on high/normal range shift switch (K) |
| 307 | Switch on high/normal range feeding direct solenoid and converter solenoid |
| 311 | Brake governor switch (C) joining 312 to low side of governor |
| 312 | Convertor solenoid to brake governor switch (C) |
| 313 | Common lead on brake governor switches to high side of governor |
| 314 | Brake governor switch (B) to direct solenoid |
| 315 | Low range switch (F) on low/high range shift to high range solenoid |
| 316 | High range solenoid ground |
| 317 | Clutch switch (D) to clutch solenoid |
| 318 | Clutch solenoid to clutch solenoid ground switch (J) on converter direct shift |
| 319 | Common side of throttle cutoff switch and clutch grounding switch to grounding terminal on terminal box |
| 320 | Brake throttle switch to grounding terminal on terminal box |
| 321 | Transmission lube pressure gauge circuit |
| 324 | Transmission temperature gauge circuit |
| 325 | Red flasher light with switch indicator and flasher |
| 326 | Differential low oil pressure warning light |
| 327 | Transmission high oil temperature warning light |
| 329 | Feed to transmission and steering control |
| 330 | Transmission high range control |
| 331 | Transmission low range control |
| 332 | Transmission reverse range control |
| 333 | Transmission clutch lockup control |
| 334 | Steer control right |
| 335 | Steer control left |
| 336 | Converter low oil pressure |
| 337 | Pilot control indicator circuit |
| 338 | Co-pilot control indicator circuit |
| 339 | Converter low lubricating oil pressure |
| 340 | Speed selector switches feed, pilot |
| 341 | Steer selector switches feed, pilot |
| 342 | Speed selector switches feed, co-pilot |
| 343 | Steer selector switches feed, co-pilot |
| 344 | Inlet fan, right |
| 345 | Inlet fan, left |
| 346 | Circulating fan, right |
| 347 | Circulating fan, left |
| 400 | Heater feed |
| 401 | Heater starting switch to coil and indicator light |
| 402 | Heater starting switch to pump and solenoid valve |
| 403 | Running switch to thermal switch |
| 404 | Thermal switch to heater starting switch |
| 405 | Heater starting switch to motor and indicator light if used |
| 406 | Heater ignition circuit and indicator light if used |
| 407 | Heater in operating position indicator circuit |
| 408 | Oil heater circuit including indicator |
| 409 | Compartment heater circuit, including control unit |
| 410 | Safety valve reset circuit |
| 411 | Ventilation fan lead |
| 412 | Auxiliary generator transfer switch to battery heater and indicator |
| 413 | Heater relay control circuit |
| 414 | Auxiliary generator voltage control reostat to voltage regulator |
| 415 | Feed to special ventilating fan or rotoclone |
| 416 | Ground lead for special ventilating fan or rotoclone |
| 417 | Auxiliary shunt to auxiliary ammeter positive |
| 418 | Auxiliary shunt to auxiliary ammeter negative |
| 419 | Main feed to auxiliary control box |
| 420 | Auxiliary engine oil pressure gauge circuit |
| 421 | Auxiliary engine fuel cut off valve |
| 422 | Auxiliary engine magneto ground |
| 423 | Signal lamp auxiliary interphone |
| 424 | Field telephone auxiliary interphone |
| 425 | Field telephone auxiliary interphone |
| 426 | Ground auxiliary interphone |
| 427 | Tachometer, electric, "A" terminal, send to receive |
| 428 | Tachometer, electric, "B" terminal, send to receive |
| 429 | Tachometer, electric, "C" terminal, send to receive |
| 430 | Tachometer, electric, "D" terminal, send to receive |
| 431 | Speedometer, electric, "A" terminal, send to receive |
| 432 | Speedometer, electric, "B" terminal, send to receive |
| 433 | Speedometer, electric, "C" terminal, send to receive |
| 434 | Speedometer, electric, "D" terminal, send to receive |
| 435 | Rear door emergency warning light |
| 436 | Comp. feed including relay |
| 437 | Comp. relay control circuit including switch |
| 450 | Bilge pump switches feed and jumper between switches |
| 451 | Bilge pump switch to rear bilge pump |
| 452 | Bilge pump switch to front bilge pump |
| 453 | Ignition retard circuit, starter to solenoid through normally closed switch |
| 454 | Ignition retard circuit, battery to normally open side of switch |
| 455 | Two speed generator control circuit |
| 456 | Auxiliary generator disconnect control circuit including the switch |
| 457 | Interphone #10 |
| 458 | Engine fan clutch circuit |
| 459 | Control circuit for master relay and indicator light |
| 459B | Master relay feed |
| 460 | Turn indicator circuit, right, front signal/marker lights |
| 461 | Turn indicator circuit, left, front signal/marker lights |
| 462 | Generator equalizer circuit, shunt type |
| 463 | Interphone #11 |
| 464 | Interphone #12 |
| 465 | Range finder feed |
| 466 | Range finder ground lead |
| 467 | Light switch to turn indicator switch feed |
| 468 | Bulldozer actuator armature feed |
| 469 | Bulldozer actuator field and clutch feed |
| 470 | Bulldozer control solenoid valve circuit |
| 471 | Winch control switch feed |
| 472 | Winch reverse solenoid circuit |
| 473 | Winch forward solenoid circuit |
| 474 | Front end fuel tank solenoid |
| 475 | Rear end fuel tank solenoid |
| 476 | Transmission fan clutch circuit |
| 477 | Differential filter pressure circuit |
| 478 | Generator equalizer circuit, interpole type |
| 478A | Auxiliary generator equalizer circuit |
| 478M | Main generator equalizer circuit |
| 479 | Battery heater control circuit |
| 480 | Wrecker solenoid valve control circuit |
| 481 | Magneto switch feed |
| 482 | Feed to auxiliary engine magneto grounding relay |
| 483 | Turn indicator, right blackout light |
| 484 | Turn indicator, left blackout light |
| 485 | Cab feed |
| 486 | Manifold heater, main engine |
| 487 | Manifold heater, auxiliary engine |
| 488 | Rectifier control to master relay circuit |
| 489 | Clearance lamp service feed |
| 490 | Clearance lamp blackout feed |
| 491 | Parking lights to light switch |
| 492 | Ignition ground, ground mag. switch |
| 493 | Auxiliary generator temperature indicator circuit |
| 494 | Engine decompression control circuit |
| 495 | Transmission oil level gauge circuit |
| 496 | Flood or spot lamp ground |
| 497 | Red flasher ground |
| 500 | Three phase circuit lead "A" |
| 501 | Three phase circuit lead "B" |
| 502 | Three phase circuit lead "C" |
| 503 | Motor generator/alternator feed |
| 504 | Motor generator/alternator ground |
| 505 | Motor generator/alternator control box feed |
| 506 | Generator charge indicator circuit, left or main engine |
| 507 | Generator charge indicator circuit, right engine |
| 508 | Generator charge indicator circuit, auxiliary engine |
| 509 | Warning light circuit, selective warning system |
| 511 | Battery heater feed, from engine generator to series paralleling switch |
| 512 | Battery heater feed, battery heaters in parallel |
| 513 | Battery heater feed, battery heaters in series |
| 514 | Dimmer switch to blackout upper beam (IR) |
| 515 | Dimmer switch to blackout lower beam (IR) |
| 516 | Power pack feed (IR) |
| 517 | Periscope feed (IR) |
| 518 | Flood or work lamp feed |
| 519 | High beam indicator circuit |
| 520 | Main light switch to IR BOD selector |
| 550 | Power feed to pulsing relay box |
| 551 | Traverse lead between cont. potentiometer wiper and relay contacts |
| 552 | Traverse center tap on cont. handle potentiometer to deat spot res. |
| 553 | Elevation center tap on cont. handle potentiometer to deat spot res. |
| 554 | Elevation lead between cont. potentiometer wiper and relay contacts |
| 555 | Common ground in pulsing relay system |
| 600 | Elevation tracking motor feed |
| 601 | Tracking motor elevating circuit |
| 602 | Tracking motor depressing circuit |
| 603 | Elevation gyro gauge circuit |
| 604 | Elevation gyro motor and pickoff motor feed |
| 605 | Elevating electrodyne feed |
| 606 | Elevating electrodyne circuit |
| 607 | Depressing electrodyne circuit |
| 608 | Traverse tracking motor feed |
| 609 | Tracking motor left traversing circuit |
| 610 | Tracking motor right traversing circuit |
| 611 | Traverse gyro gauge circuit |
| 612 | Traverse gyro motor and pickoff motor feed |
| 613 | Left traversing electrodyne circuit |
| 614 | Right traversing electrodyne circuit |
| 615 | Traversing electrodyne feed |
| 616 | Hydraulic valve circuit |
| 617 | Loaders traverse safety lamp feed |
| 618 | Delay relay coil circuit |
| 619 | Thermo delay switch actuating circuit |
| 620 | Delay relay holding circuit |
| 621 | Gunners handle pickoff motor feed |
| 622 | Commanders handle pickoff motor feed |
| 623 | Commanders override circuit |
| 624 | Commanders override switch feed |
| 625 | Main positive feed to turret control box |
| 630 | Delay circuit feed |
| 631 | Safety lamp return |
| 632 | Loaders safety switch and safety lamp feed |
| 633 | Loaders safety relay coil circuit |
| 640 | Auxiliary generator decompression circuit |
| 641 | Booster motor control |
| 642 | Booster motor power |
| 643 | Inverter feed |
| 644 | Inverter ground |
| 645 | Turret relay control circuit |
| 700 | Single phase 115 volt grounded |
| 701 | Single phase 115 volt |
| 702 | Receptacle outlet 115 volt |
| 703 | Blackout light switch feed 115 volt |
| 704 | Converter feed 115 volt |
| 705 | Blackout dome lamp feed 115 volt |
| 706 | Service dome lamp feed including switch 115 volt |
| 707 | Blackout switch from blackout lamp feed to blackout relay 115 volt |
| 708 | Blackout relay to blackout switch and service dome lamp 115 volt |
| 709 | Blackout relay energizing coil feed including blackout door switch |
| 710 | Blackout relay energizing coil return |
| 801 | Ratio selector switch, high |
| 802 | Ratio selector switch, low |
| 803 | Left traverse switch |
| 804 | Right traverse switch |
| 805 | Up elevation switch |
| 806 | Down elevation switch |
| 807 | Ratio selector, low external feed |
| 808 | Ratio selector, high external feed |
| 809 | Traverse hydraulic motor brake |
| 810 | Traverse potentiometer, left |
| 811 | Traverse potentiometer, right |
| 812 | Traverse and elevation potentiometer wipers, ground |
| 813 | Elevation potentiometer, up |
| 814 | Elevation potentiometer, down |
| 815 | Input to ratio selector switch |
| 816 | Input to traverse switches |
| 817 | Input to elevation switches |
| 818 | Cannon firing circuit |
| 820 | DC power to bridge box for amplifier heaters |
| 821 | Firing circuit DC to override relay |
| 822 | DC power for directional switches to override relay |
| 823 | DC power to inverter, pin lock, solenoid, and ratio solenoid |
| 824 | Bypass solenoid valve ground circuit through pressure switches |
| 825 | Solenoid valves ground circuit through line relay |
| 830 | AC to traverse velocity generator, primary |
| 831 | Ground side traverse velocity generator, secondary |
| 832 | Ground side traverse velocity generator, primary |
| 833 | Output traverse velocity generator, secondary |
| 834 | AC to elevation velocity generator, primary |
| 835 | Ground side elevation velocity generator, primary |
| 836 | Ground side elevation velocity generator, secondary |
| 837 | Output elevation velocity generator, secondary |
| 838 | Output of traverse amplifier |
| 839 | Ground for traverse amplifier |
| 840 | Traverse amplifier heater circuit |
| 841 | Traverse amplifier AC power feed |
| 842 | Velocity generator input to traverse amplifier |
| 843 | Bridge input to traverse amplifier |
| 844 | Bridge input to elevation amplifier |
| 845 | Velocity generator input to elevation amplifier |
| 846 | Elevation amplifier AC power feed |
| 847 | Elevation amplifier heater circuit |
| 848 | Ground for elevation amplifier |
| 849 | Output of elevation amplifier |
| 850 | Elevation servo balance potentiometer, up |
| 85 | Elevation servo balance potentiometer, wiper |
| 852 | Elevation servo balance potentiometer, down |
| 853 | Elevation servo |
| 854 | Elevation servo amplifier phase ground |
| 855 | Elevation servo line phase ground |
| 856 | Elevation servo line phase |
| 857 | Traverse servo balance potentiometer, right |
| 858 | Traverse servo balance potentiometer, wiper |
| 859 | Traverse servo balance potentiometer, left |
| 860 | Traverse servo amplifier phase |
| 861 | Traverse servo amplifier phase ground |
| 862 | Traverse servo line phase ground |
| 863 | Traverse servo line phase |
| 870 | Right traverse pilot valve solenoid |
| 871 | Left traverse pilot valve solenoid |
| 872 | Up elevation pilot valve solenoid |
| 873 | Down elevation pilot valve solenoid |
| 875 | Elevation limit potentiometer, down |
| 876 | Elevation limit potentiometer, up |
| 877 | Elevation limit potentiometer, up wiper |
| 878 | Elevation limit potentiometer, down wiper |
| 879 | AC power from inverter |
| 880 | Ratio selector governor and relay |
| 881 | Lock switch power feed |
| 882 | Turret lock switch on |
| 883 | Turret lock switch off |
| 884 | Gun lock power |
| 885 | Gun lock switch on |
| 886 | Gun lock switch off |
| 887 | Inverter ground |
| 888 | Turret lock power |
| 889 | Contactor to limit switch |
| 891 | Brake solenoid including contactor to battery |
| 892 | Turret lock motor armature and fields |
| 893 | Inverter power feed |
| 894 | Breech switch feed |
| 895 | Traverse interference switch feed |
| 896 | Oil gear elevation solenoid valve |
| 900 | Flame thrower battery lead |
| 901 | Flame thrower ignition coil to ignition switch |
| 902 | Flame thrower ignition coil to spark plugs |
| 903 | Flame thrower atomizing fuel solenoid valves to switch |
| 904 | Flame thrower main fuel solenoid valves to switch |
| 905 | Flame thrower timer to switch |
| 906 | Flame thrower secondary fuel solenoid valve to switch |
| 925 | Turret lock lamp switch feed |
| 950 | External voltage adjustment control rheostat |
| 951 | Boom auxiliary power motor cotrol |
| 952 | Boom auxiliary motor feed |
