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OK. So you are now getting some voltage to the exciter wire but definitely not all that could be getting there. Since you went from 0 to 7 volts by just moving the 2 plugs. Can you unplug them both again and do an Ohm check on that brown wire from end to end? It still could just be a frayed...
Is your resistor bypassed in the glow plug system? Was the 7 volts taken with the engine off and the plugs glowing?
Together you would have at most 10 volts with the engine off and the plugs glowing.
Since the only thing you did was the firewall plug and the alternator plug check. It seems...
Welcome to the fun.
Yes the instrument connector in in the back of the gauge cluster. Treat it with respect and be very nice to it. The little copper tabs bend and break very easily. That by itself could be your problem source.
Yes the firewall plug is at the rear of the fuse panel. GM put...
Going used and rebuilding is what I have done on all of my 24 volt trucks as well. Someone near you has one on a shelf In all likelihood.
Make sure you get the proper support bracket for the style starter you end up with and I would also suggest new start bolts as well.
The HMMWV -20 TM has...
I have learned to remove the air filter, put a lawn chair cushion over it and the front of the engine and then lay on it. With a 1/4” drive ratchet with a 1/4” short socket on it. I can then work a hand under the back of the intake to the hose clamp and loosen it. The hose is also a 1/4” ID...
When I was rebuilding my Gasser M35 16 years ago I had just the cab bottom, a seat and a few other things assembled. I took it for a drive. Watching the rear axles move in every different direction caused me to worry as you did to start this thread. Do your inspection as suggested above. You...
I will try to answer in order asked.
No, the engine does not idle up with the compressor engaged. However, it also doesn’t slow down. The injection pump has a low and high speed governor. The low speed governor pretty much maintains the idle speed regardless of the load on it. To a point.
I...
Lets tackle the alternators separately.
ALT 1 on the drivers side has an isolated ground wire but doesn’t need it since it is for the 12 volt truck system side of the fun. If you can touch a test light to it and it works while the test light is touching the case. Then I suggest checking the...
That is a 6.5 IP. Maybe your engine is a 6.5? Here is a video about what the numbers on the pump mean:
It also shows the pink wire and green wire stock attachments.
Depending on where you are in New Mexico or where the truck was. Advanced timing and higher idle might have been needed just...
The pink wire in a stock configuration is hot with 12 volts when the key is on.
The green wire when stock goes to the sensor at the outside rear of the passenger head. That sensor has another wire that is hot anytime the key is on.
The sensor is supposed to put power to the green wires...
So, you have heat, fuel and air. It should run. How fast is it turning over? The batteries have to be fully charged and the starter has to be spinning the engine fast. Otherwise it won’t get the heat from the compression stroke to run.
My other thought is air in the fuel. Replacing the lift...
Oil is the life blood of an engine. Looping the cooler lines is ok for test running an engine on a stand. But, for a vehicle under load I think it would be a bad idea.
I have a stand alone air to oil cooler on one of my trucks with an oil temperature gauge. Driving in 20° F air still has the...
The aluminum line across the radiator is a built in cooling feature of the set up.
The stock hose and line oil cooler lines have had a bad history. There was a recall on the hoses next to the block. (If you want to waste some time, call a Chevy dealer with your VIN. You might have a truck that...
I drove mine this morning. I did notice the coolant red light came on only while the starter was engaged. I normally don’t watch the lights once the glow light goes out since there is no oil psi to watch. I go to the ALT lights on start up normally. But, I was thinking of this thread and caught...
I just went and tried one of mine. Turning the key on had the following lights come on.
ALT 1
ALT 2
OIL
Low Coolant
Fasten Seat Belts
Glow Plug
The low coolant went out after 5 seconds of not starting while waiting for the glow plugs to finish.
The oil went out within a second or so of...
No check engine light. Mentally figure you have no lights about the engine health. Pay attention to the ALT 1 and ALT 2 lights though. They are part of the charging system and need to be noticed.
The stock thermostat is a 195° part that starts to open at 192° and is fully open at 203°...
That looks like a replacement data plate. Which means you get to play detective.
Riveted rear motor mount brackets to the frame normally mean the truck came with a multi fuel. 1960 or so and newer was all multifuel production.
Solid state flasher and blinkers came along in 1967 or so. Those...
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