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It is probably the seat belt warning buzzer wire.

Is this the stock 24v - 12v resistor that sits on the firewall, or an actual voltage converter? If it is an actual 24v to 12v converter, what are its specs? The glow plugs draw quite a bit of current, and perhaps the convert can't handle the load? Please post pictures of your setup!

And why did they decide to control the ground side of it with a relay, rather than the hot side?

What you are referring to is called "parallax error" and is common with any gauge with a needle. This is why the passenger sees a different reading then the driver. My old voltmeter, a test instrument - not to be confused with the one in the dash, had a mirrored strip so you could tell when you...

It could mean that the GP temp sensor is bad, or perhaps the GP controller card is bad.

Should be a standard part from an '84 Blazer.

Test it and see. There are two relays next to each other, perhaps the wrong one was replaced? Just be careful pulling out the meter, as it is hot with 24v at all times. Best to disconnect the batteries while pulling it, then reconnect for testing.

My ATF 'mystery leak' turned out to be the fiber washer on the transmission drain plug.

That is a very strange situation. So it is not just one particular socket, but whichever bulb is plugged in last?

Just out of curiosity, have you turned the brightness up all the way?

Replace the short section of fuel line at the return check valve on the top of the IP with a clear piece of fuel line. Then you can see if you are getting air in the lines. If so, closely examine the fuel filter to see if the fuel pressure sensor on the back of the filter base is leaking. Also...

Fully charge the batteries, and then have them load tested. If the batteries aren't up to par, that may have led to the starter needing to be rebuilt the first time.

It requires special tools to calibrate them correctly. I'd suggest a PM to Cucvrus, as he has a place he likes to send them to to be rebuilt.

My understanding is that the main concern is that a bad balancer / dampener can lead to a broken crank. When I got my truck, the rubber on the balancer / dampener had some cracks and bulges in it, so it got replaced, along with the front seal. I don't remember the brand I used, but I believe it...

Do a search, there was some discussion on this a few years ago. And yes, they are $$.

I've read on here where a ground issue at the ground block under the dash by the parking brake pedal can cause this. Don't know why, just what I read.

If you suspect the heads, you can either buy a kit, or take it to a shop and sniff the radiator for exhaust gasses. A shop could probably do a pressure test to see if the pressure is indeed too high.

Fully charge the batteries, and then have them load tested. Perhaps the rear battery has gone south.

axle u-joints?

The glow plugs in the CUCV trucks are 12v parts. In the HMMWV they are 24v parts. In the CUCV, the glow plugs are supplied with 24v that passes through a voltage divider network made up of the glow plug resistor bank on the firewall and the resistance of the glow plugs themselves, thus they only...