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Many thanks all. Due to the many other hat's I wear I haven't gotten back to actual work on the truck. However I have read and digested the pointers and suggestions that all have made. As soon as I can do the testing and repairs that have been offered here or found other issues (fingers crossed...

Yes I will have to agree on all counts dmetalmiki. The HUlk I haven't checked the CB resistance yet, found it on the wiring diagram quicker than I found it on the truck. Am going to track down a relay believe that is a suspect also. The alternator I'll have to pull and take to a local shop. The...

Yes I will have to agree on all counts.

The batteries had long since been replaced with regular commercial truck batteries. Yes the positive clamp had been changed and the negative clamp is well worn. Both terminals are on the same end of the battery close to the frame.

Yes they were hooked back up as a positive ground or backwards. The batteries had been taken out to charge and the person that put them back in hooked it up wrong. The truck had worked properly until this occurred.

Hello all new member here with a real good one for you all. I am currently trying to solve a major issue on an M817 circa 1982 5 ton. Upon my inspection of this vehicle I found that the batteries had been connected backwards. Positive on negative terminal and negative on positive terminal...