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Start your truck, then disconnect both batteries, if all your lights and everything still work and the truck still runs, alternator is doing its job, if not, the alternator isn't doing anything or you have a bad connection..
Another way gauranteeing its the alternator is with a voltometer. Hook it to the batteries when its not running and it should be around 12V, when you start it up you should be up to around 14Volts. If not, then its the alternator, but I would run through all the wires and make sure they aren't corroded or anything and that everything is getting a connection...
1997 2500 12V Cummins 5spd 2wd 356k
1994 Jeep Cherokee 4.0 H.O. 5spd 4wd 280k
Last edited by ISX; 01-22-2007 at 08:44 PM.