Ok my Alternator took a crap on me. We were recharging the A/C and I guess the alternator went out then. When I went to roll up a window, the whole truck died. I mean everything, no lights, nothign when you turned the key, no buzzers, nothing. We charged tha batteries for about 30 min., but still nothing, the whole truck was deal. We ran a jumper wire from the battery or the solinoid (I don't remeber which) to the power block on the back of the firewall. Truck had power and started up. Let it run for a few mins. turned it off and it started up again untill the batteries were dead. So I chenged teh alternator but it's dead again, and I need to jump it. Is there a fusable link or something that I need to fix? I can't figure out why running a jumper wire will get it to start and it's fine unless the battery runs to low. Oh ya it's a 82 Jimmy with a 6.2L diesel and factory dual batteries/.