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The OP sensor is a 3 wire sensor. The DCS provides it 5 VDC and ground to power it. It's ratio metric output varies from 0.5 VDC at 0 PSI to 4.5 VDC at 100 PSI. Maybe put a meter on its output terminal C and monitor its output voltage to see if it's incorrect?

Was the -4 reading on the DCS after the engine stopped?

You should have good continuity, zero-ish ohms, between all the points in my diagram. If you don't then you need to dig into the wiring path between the two points.

M8 terminal 1 to J6-7 is wire 162A. P6-7 to S8-44 is wire 162B. If you are measuring 120 ohms, then you may have a bad splice or poor connection between the contacts J6-7 and P6-7 ..............Wire 162A.........................................Wire 162B...

S8 is similar to S6 on how the terminals are arranged. All odd numberer terminals on one side and evens on the other. Here is a shot of some of S8's odd terminals.

To check the resistance of any of those resistors you need to disconnect the wire(s) from one end of the resistor first. S6 "odd" Terminals S6 "even" terminals

I attached some display pics for comparison to yours. Just happened to run it today for testing a DCS. (Ignore the 114 V AC in the first pic. I hadn't adjusted the voltage regulator yet) My 1030 with ~ 50% load on it after running a minute or two. Coolant temp 123F with 60 PSI Oil Pressure...

You'd check the current at M8 using your clamp on ammeter. The right meter in your pic. Clamp it around ONE of the two wires going to M8. It doesn't matter which one. Like this.. Set the meter to 40 AMP AC setting Zero the meter is necessary. Be sure the generators AM-VM switch is in the 3...

Did you see if there was current flowing through the Load meter? If so how much?

Troubleshoot. Don't throw parts at the problem. Put a DMM in series with M8 to measure the current thru it and see if it jives with what M8 displays for load.

No. The %Load meter M8 is not connected to +24 volts or chassis ground. The %Load meter is an AC Current meter. 0-1 Amp Full Scale In a nutshell... The 3 Current Transformers in CT assembly each output a current that's proportional to the load they are sensing on the 3 legs of the generator...

On one side of the switch the terminals are odd numbered and the terminals on the other side are even numbered.

Have you reset the Overspeed switch?

For AC voltage to get to the lugs you need to close the AC Circuit Interrupter (contactor). I don't see the AC Circuit Interrupter lamp on, so it appears the contactor is still open. Lack of voltage to the outlet may be due to the GFCI being tripped or the circuit breaker on the side of the GFCI...

The fuse is a KTK-3 fuse. 3 amp Fast Acting Fuse. If the fuse is blown it's generally not a good sign. That fuse is there to protect the gen heads Static Exciter should the AC Voltage Regulator put out way too much voltage to it. Without that fuse the AC Voltage Regulator has no control on the...

If you haven't already downloaded the Maintenance and Repair TM 9-6115-643-24 from the TM download section of this forum do that for starters. From your video it appears there is an issue with the AC Voltage Regulation system. When you started the set and had S1 in the START position after it...

DS6 is getting +24 volt power from the Fuel Gauge terminal M5-I whenever S1 is in RUN so K1-1 is fed +24 volts as well as DS6-1. The tricky bit is the following... The contactor closes when S5 is lifted to CLOSE the contactor. When the contactor closes it also closes some auxiliary contacts in...

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