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I completely agree. It makes no difference. I wired my M715 up exactly like a CUCV when I put the 6.2 in it a few months ago. I had the 12V power pulled from the positive of the front battery. However, while my students were looking at the wiring diagram, they kept telling me I had it wrong...

There isn't a step down. If you put your volt meter negative lead on the front battery negative terminal and positive lead on the front battery positive terminal, you will get 12-14.4 volts. If you put your volt meter negative on the rear battery negative terminal and the positive lead on the...

Check at the positive and negative terminal for the battery charged by the alternator you are checking. Drivers side alternator does the front battery and passenger side alternator does the rear battery.

The video of your light going off and on along with your 13.6-14.4 range with the engine running. Say voltage regulator to me . However, did you check the big plug at the firewall, check the ground strap for GEN 1, all the connections on all 3 firewall connections areas plus your battery...

Yep, everything seems to be working good. The volt meter will be right at the yellow/green line or a little below at start up cold because the glow plugs stay on for 5-30 seconds after start up depening on how cold the engine is. Then, you will hear the glow plug relay kick off and the needle...

You have several problems not really related to each other happening at the same time. Glow plug card issues, glow plug relay issues and then the charging system issues which cause your low batteries. Theory wise, your volt meter being lower meant all or at least more of your glow plugs were...

You need to unplug the plug from the alternator. The purpose of testing with it un plugged is to determine if the problem is with the alternator or with the truck. That 3.5 volts could be from a short in the alternator or a broken wire on the truck. We don't know which at this point. Yes...

Joe summed up what wasn't already mentioned real well. I will add this. If your volt meter on the truck is just staying at the yellow/green divide. You probably only have 1 working alternator. Do your checks and tell us what you find.

Thanks Joe. I was thinking M35 manuals when I wrote the first post. Sorry about any confusion.

The M1010 is a different animal when it comes to the charging system. Because of the huge 24V load the box on the back of the M1010 needs, they just put a single alternator on the truck. 24V. Don't read about M1010 stuff unless you want to be confused. The rest of the Chevy CUCV series uses...

Bad batteries was my first thought as well. What kind of voltage do they have with the engine off? Check that, then start it and see how far they drop while starting. The 1/2-1 second it takes to start a 6.2 should not drop them down much below 12.0 volts. Anything below 11.0 volts while...

I would look for loose or grounding wires if you have an intermittant fault. The Diode Trio is a solid state component and it pretty much a good or bad. Not a sometimes. Does your volt meter move up or down with the light showing up or not? I ask because the si alternators just need the...

I am new to the CUCV world. Not the MV world or this site though. I have been reading for years about CUCV starter, glow plug and alternator troubles. So much that I was really hesitant to get one for myself. So, now that I have one I want to pass on a few things I have learned about the...