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The only people who are going to get it to work are ones with c7 trucks and a msd. It’s a hard to find combo.

The front ones look the same.

Whole different creature. The 3116 is a lot closer.

Did you find the a1 c7 tm?

They did away with the cab levelers in the c7 trucks.

If they are the same as the earlier trucks they are around. Or you can use hockey pucks.

I can take pics Monday if no one else has one sooner.

Did you check the engine/trans fluids? Does it run?

What year truck? 3126 or c7?

On a m939 I had a pcb go bad and the truck kept cranking. I am not a humvee expert but if the glow plug controller doubles as the starter/power relays then that might be your culprit. You can check the ignition switch with a multimeter.

Sounds like the start and run leads are switched. Try and switch them. There is only 3 connections. 24v positive, run and crank.

Your pm box is full. Email me will atpawnking dotcom

Just got an alternator in

You just cant leave it permanently connected. Needs to be switched with the truck ignition.

I think the shunt is used for the diagnostics. The regulation voltage lead cones thru the cab power panel, which goes thru the polarity box. Although the fuel solenoid is a better connection, it’s still from the same source. If you are getting an intermittent drop in voltage at the panel, and...

4 batteries. Two 12 volt batteries in series paralleled to another matched series pair. So you have the negative, then between the two series pairs is 12 volt and both series sets make 24 volts.

The alternator cables go to the same terminals on the polarity box that the battery cables do (in). The cables going to the cab come off the other terminals on the polarity box (out). You have a big 24v batt lead right to the starter and a big ground to the starter from the batt box. All of the...

Something is going on there. There are separate cables going to the starter from the batteries. Then you have 12 and 24 volt cables going into the cab thru the polarity box. And a pair of 12 and 24 volt cables from the alternator to the batts.

They are still worth money. Good chance your regulator is good and the alt is not. Since it works for a second or two when you start the truck. Dont get rid of any of it. Peek in with a light see if maybe a piece of something fell into the alt. Take it off and shake it.