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kwik questions... if my truck is on and I remove the positive wire from the battery. should the truck stay on? if it doesn't, what can the problem be? just got the alternator checked and it's good.

That is a good question. I know on military HMMWVs if you take the pos away it will die but not real sure on the civilian trucks.

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Some times I amaze even myself!!!!

I would bet a wire issue some where in the harness. When you say it is charging, are you checking it at the battery with the battery hooked up?

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Certified pilots, looking down on people since 1903.

I got the alternator checked at autozone... I'm just removing the positve wire from the battery and it turns off immediately. I've had this issue for a while now and trying to fix it. the gen light is on in the dash too.

Pulling the battery wire off the battery while it is running IS NOT a good way to test as you can get a voltage spike in the alt. and kill it or worse although rare the alt can short out the diodes and now you will have 120-140 ac volts in your hand.
The best way to check is with a volt meter.

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1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s