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My M1009 is still up on jacks so I cannot yet get the photo's, but I thought I would attach a copy of the reworked wiring diagram I used to fix my truck...

I will try to get some photos on Tuesday. I have a wiring diagram that I used to trace out my charging problem. That is how I determined that I was missing the ground wire. I haven't seen any smoke coming from engine wiring. As for what happened to the original ground wire, I have no idea...

OK.... I am a dumb ______ (Insert your own adjective). Charging problem solved by adding a grounding wire from the engine to the isolated ground post on the drivers side alternator. Charging just fine now...

Hello everyone. I have been trying to diagnose the charging problems on my M1009. I have read the thread about how to check the alternators while they are on the truck, but I don't understand the directions. My alternators don't have the markings discussed in the thread. The charging system...