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You need an equalizer. You can't pull a lot of current off of the 12 volt batteries without causing problems. If the truck is all 24 volts, a dual voltage alternator won't supply enough current on the 24 volt side if you have AC or other high current accessories.

You can test the alternator on the vehicle with the engine running by connecting a wire from the B+ terminal on the alternator under test to the #1 and #2 regulator terminals. Just unplug the regulator connector for the test. All the other wires from the vehicle need to be connected to the...

Since the truck is all 12 volts except for the starter, the driver's side alternator powers the vehicle if you have the stock electrical system. The passenger side alternator only charges the second battery used for the starter, so it doesn't really add to the system capacity unless you are...

You will be OK. These alternators were used on a lot of GM vehicles that had AC, electric windows, in addition to head lights etc. They all operated fine at idle.

I had the same problem matching fonts when I painted my M929. I ended up tracing over the original pictures in Acad and then importing the file into my cutting software.

Sounds like something is keeping the transmission from upshifting. Back in the day, I had the down shift switch break with the rod stuck inside and the switch was on. That kept the TH400 from upshifting. I think CUCV's have a mechanical linkage for down shifting based on throttle position. I'd...

A couple of spring brake cage bolts and plugs for the airline.

I've had that happen a couple of times. Ebay is pretty good about refunding your money if you can't work things out with the seller. If the seller wants me to pay for the return shipping, I tell them I'm not responsible for your mistake. If you want it back, send me a paid shipping label.

I also used the Baldwin part simp listed. I didn't see it commented on but there are two small gaskets in the kit. One is thinner than the other. After trial fitting it with the thin gasket, I decided to use the thicker one when I installed mine. I have seen people suggest using the thin one...

Square more better.

M373A2 is a 2" king pin. Level plate height is a little more than 4'. It sits slightly nose down behind my M915A1

Isolated ground means exactly that. The ground terminal on the alternator should be isolated from the alternator case. There is a link to my alternator rebuild thread in my signature. There are pictures that will help you understand how everything goes together.

Our biggest problem is the weight of the truck. My M929 is about 26K empty. Any M939 derivative with similar dump bed and hydraulics is going to be the same. To compound the problem, our axle ratings are also lower. You really can't do anything about these things. For example, the fellow I...

For $24, I'm tempted to buy one to try it. You do anything special to spray paint with it?

The box on my M929 looks like it is about a foot forward of being centered over the tandems. I'm looking at a picture but I can measure it. Most of the civi dump trucks I've seen have the tandems near the rear of the box in addition to the box being much longer. They also have much higher...

You need to consider a shorter length because you are going to have a lot of frame twisting off road. Also, heavy and high is a problem you can't easily fix after you build it. If you seriously want to build something you can use for off road camping it needs to be short and lite. The truck in...

If you haven't already done it, you should be measuring the voltage at the batteries with a DMM before you decide the alternator is bad. The installed volt meters are not that accurate. The volt meter in my M929 reads in the middle of the yellow but the batteries are at 28 volts with the engine...

I think it's fairly common to use Romex in RVs for the AC wiring. I have a 2005 Airstream classic and it has solid copper wire for the AC circuits. I used Romex in my M373 build. It's easy to work with and inexpensive. As long as you have the proper strain relief you should not have any...

Check out Bus Grease Monkey on Youtube. He works on old Greyhound buses with the Detroit engines. Lots of good content and hands on rebuilding and setup stuff. The guy knows his way around a Detroit. Good luck with your project.

I see no one including the OP has the correct answer to the OP's question. Though I'll admit that hauling off your ex's stuff is pretty good, but that's not the real answer. I'm surprised that I have to say it. The answer is...... Because I want it.