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Roger that. I am first going to rebuild both alts. David

Yes, thanks I have thought of that and may do it after I exhaust all efforts to solve the problem. David

Yep, DH I think you and Joe are correct. David

The plug you are talking about is the 2 wire plug on the back of of the Alts. The red wire is hot 12v and the brown wire is the exciter wire that is connected to your Gen light in the dash. What I am interested in is what Joe said the other day...can a bad Alt. pull a draw with the key off...

I think you are on to something...because the test light didn't come on when I tested the rear battery. Should I test the front battery Neg - post/cable and if the light comes on go through the fuses again?

Yes, both batteries are fully charged and load tested. I will check the test light from the front battery neg- post to neg- cable. Thanks.

Ok, thanks, I will try again with it set to amps. Also, when hooking up the batts again this time no sparks of any kind. David

Ok, tested per above and this is what I got: test light from - neg to +pos on rear battery the light came on (test) test light from pos+ battery cable to Pos + post of rear battery no light Voltmeter from Pos+ battery cable to Pos+ post = 12.82v (key off not running) with voltmeter...

Ok, thanks. So disconnect thet rear pos + and test that battery with the test light/volt meter? To check for draw? Could I then remove fuses to test the circuits?

Hey Joe, I was hoping that you would chime in. the funny thing is that the truck sat around for weeks then in one night the batteries were dead? So am I correct in thinking that there is a draw on the system when hooked up because of the sparks when hooking up the battery cables correctly...

Fixed, i wrote it in word. That's why the black font. Also, cutting and pasting into the forum does strange formating things to the text. Thanks, David

The M1008 has all new GP system/plugs/card/switch,starter relay upgrade ect... and the batteries are 6mos old group 31 Exide made in 2012. Previously the volt meter has always been dead on the hash mark and Gen lights work correctly. The truck has been sitting for a few months with weekly...