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I had time this afternoon to do a search and while I was reading through the different threads on the subject I learned the location of the diode near the fire wall. When I went out to the truck to look at it I saw the broken wire. I also learned how to adjust the idle and a few other things.

ok, thanks for the help guys. I fixed it. it was what looks like a fusable link that coroded apart at the crimp connector when it was replaced before. I twisted the wires together and now my gen 2 light comes on. i will solder them together when I get home. thanks again!!

looking back i see I missed this. No it does not turn on when the key is on.

ok, the 24v fuse in the box looks intact. the fusible link looks and feels intact at the alternator. the gen 2 bulb does not come on when I turn the ignition on. This must be the problem. are the bulbs 24 volt??? where is the diode and relay on the truck? I am assuming I can check voltage...

We put a voltage meter on the bat. Only 12.3v not charging.. the mechanic said it was not charging at the alternator. And the exciter wire shoows 12 volts. What else should I be checking?

the pass side alternator is not charging on my M1008. So we took it off and bench tested it and it worked fine. Put it back on the truck and it did not work. Checked the exciter wire and it was fine. any ideas? both alternators were rebuilt a couple years ago. I havnt had any problems with them.