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Since you say that, look at the AC wiring diagram hi/low switch and there is a 24v feed from the control box. However that's only for the blower motor circuit.

You might be able to by probing around in the battery box looking for a lose connection. Use a wood dowel or stick to probe around so you don't short anything out.

Here's the AC wiring, at the bottom it shows the battery box and has nothing else in common with the rest of the electrical system. That is what leads me to believe it is in the battery box.

From just the little research I've done since reading your post and no experience with your model at all, I think the AC connects in the battery box. Also if the alternator stops functioning it may be losing it's field voltage (not an expert on HMMWV alternators). It could be something in the...

I did find a tach installation diagram and it looks like it taps the power off the positive feed to the fuel gauge. It also grounds to the gauge panel. When it goes off do you lose your fuel gauge? I'll guess that you do and assume it is similar to the earlier wiring diagrams and gets that...

Ground your meter to the battery ground and if you don't lose 24v to the tach power swap to check the ground. Put the positive meter lead on the battery +24 and put the neg meter lead on the ground at the tach. If you lose power that way, you have a ground issue.

I wasn't sure what truck you have ... yes I think you are correct. If I could find a wiring diagram for your truck it would be helpful. I will make a guess though, it may have the same type of signal generator and the chances are you are losing power to the tach and not the signal. If I were...

Based on your description, I'm going to focus on the tach. I'm not sure about your truck specifically but here is the basic operation of the tach. There is a sensor on the back of the motor with 2 wires. The sensor creates a pulse signal and it goes to the tach. The only thing the tach needs...