some one please help i cant figure it out ... i have a prolbem with my charging system in my lude. at first i thought it was a prolbem with the alternator becasue i wasnt getting any charge what so ever so i bought a new alternator and had the old one bench tested.. the old one passed the bench test with 14.3 volts so i figured i must have a shorted wire and sure enough the feed wire to the batttery had been shorted out.. so i replaced that and i figured well since i have this new alternator now id put that in.. and this is where my current prolbem is ahhhhhh , the system wont charge more then 12.48 volts yet both alternators were bench tested and passed.. and this is not nearly enought to drive the car at night or with the stereo and heater going.. i know this because i was driving home from work and my tach went out then my spedo went out then my radio then my head lights.. this was after driving for about 3 miles after warming up the car. so i pulled over shut the car off... then 5 minutes later i started it back up and was able to drive another 5 miles to the town i lived in where i left it... so my question is why wont my alternator charge 14 + volts while in the car but will on a bench test.. thanks for any help