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I will be there with CUCV GP cards.

Try checking the bulb first and all of the fuses. The dark blue wire from the GP card is a switched ground to the Wait light. See if it pulls (switches) to ground when the wait light should be on. The pink/black wire going to the wait light is the positive side. See if it has 12 volts on it...

Ditto. Just take the intake off and check all of the lines. I had the same thing happen to me. Karl

Welcome to the CUCV madness.

Very nice work!!

Your GP relay may be a bit on the tired side. The contacts need to be clean and not burnt or coated with a carbon build up. Karl

I have bought both of them from Classic Parts. They are OEM GM parts, not a crappy reproduction.

These two will work. http://www.classicparts.com/1984-90-Turnsignal-Lever-w_o-Cruisew_o-Pulse-Chrome/productinfo/29-569/#.U5T_bXYjqzo http://www.classicparts.com/1984-89-Turnsignal-Lever-w_o-Cruisew_o-Pulse-Black/productinfo/29-568/#.U5T_k3Yjqzo

AGC fuses are 1.25" long and .25" in diameter. AGY/SFE30 fuses are 1 7/16" long and .25" in diameter. AGU fuses are 1.50" long and 13/32" in diameter. http://www.littelfuse.com/~/media/automotive/datasheets/fuses/automotive-aftermarket/glass-fuses/littelfuse_aftermarket_glass.pdf

You may want to do some additional research on the CUCV electrical system http://www.steelsoldiers.com/showthread.php?60958-CUCV-Alternator-Isolated-Ground-Therory-of-Operation Each battery is charged with it's own alternator.

The pump is a rebuilt unit. I was not aware of the head temperature issue. I appreciate your sharing us with that info. But for now I will just continue to heat it until I get the urge to install another IP in it. Thank you. Karl

I don't have an explanation as to why some are hard start and some are not. As others have suggested it could be an IP problem. However, one of my trucks that has this issue has a new pump on it. So far the modification to the GP card has greatly reduced the hard starting issue on the...

Next time this happens, try manually turning on the glow plugs for about 5-8 seconds and see if it starts. I have 2 trucks that do the same thing, after sitting for 30-60 minutes it takes at least 10 seconds of cranking. I found that turning on the GP's for a short period of time, they start...

Capacitor On one of the cards that I have here it is a 10uf 25v electrolytic. The negative lead goes away from the card edge connector. Karl

Doghead is correct, it sounds like your GP system is working as it was designed to. One bad GP will change the voltage to the remaining good glow plugs. The card was protecting the remaining GP's by cycling the power to them. The after glow only happens when the card determine that it needs to...

HMMWV heads are 24 volt. CUCV heads are 12 volt isolated ground.

It's all magic.

I just went out and looked at my M1009. This is how its wired: Front battery ground goes to the Negative buss bar. Neg. buss bar has a heavy wire to engine intake manifold bolt. This is the ground to the glow plugs. Also on the intake manifold bolt connection is the ground strap to the vehicle...

The thin wire is not the glow plug ground. It can not handle the 100 amps that glow plugs draw. The thin wire is the glow plug module ground. If it is not connected the glow plug module will not function properly.

It's labeled "Ground Strap". It grounds the engine block, the engine block provides the ground for the glow plugs. Correction: This ground strap does not ground the engine. It provides a ground to the vehicle body from the engine.