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I've seen diodes short inside the alternator and draw the batts down overnight. Normally you can hear it hum with the key off. The 4 gauge red wire connected to the drivers side battery feeds the fuse box (so basically everything) on the truck. Try hooking your jumper cables just to that 4 gauge and ground. If you don't have lights etc then its something with that wire or the cjb (fuse box).
 
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