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Glad you got it figured out. After I wrote the above I went out and looked under the hood of my m1009 to make sure I had the wire colors correct. Something about the back of the drivers side alternator didn’t look right so I touched the bolted on red wire. It moved. So did the stud in the...

I am not sure what you mean by wired plug and plug on alt. There is the plug plug on the side that has 2 wires. One is always battery voltage and one (brown stock, white with replacement plug) that is 0 key off and battery voltage key on. There is also battery voltage on the red wire that...

Your exciter wire has to work for the screwdriver to the back trick to work. If you are comfortable working with electrical stuff. Just jump from the hot wire bolted to the back of the alternator to the exciter wire with it plugged in. Do this with the engine running and you should hear the...

What did the exciter wire do with the key on and off? There shouldn't be anything in the wiring that would cause you to get 25 volts at the drivers side alternator. Since it was working fine before and all your 12 volt truck components aren't leaking magic smoke out, lets just ignore the high...

That is the best way to do it. Unplug the plug from the side of the alternator. Use your volt meter to check voltage at the red wire on the back of the alaternator, then check voltage on the red wire in the plug you un did. Both should be battery voltage with the key off. the brown wire on...

Check your voltage at your battery for each alternator. As in + and - of the front battery and then + and - of the rear battery. Move both leads to the battery you are testing and let us know what you get. If you get below 14.4 at the front battery with the engine running, then you need to...