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Originally Posted by THTABE
The battery has been load tsted twice and is just over two years old and I replced the ignition switch last month. How much voltage should the alternator put out while the car is running? Any idea where can i get the alternater tested? Auto (crap) zone does not have the lugs to test this one.
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The Bosch alternator s/b putting out 13.5V - 14.5V under load. Anything in that range indicates OK, anything outside that range (upper or lower) indicates a problem.
If your diodes are good (voltage regulator), it's unusual for the Bosch to have problems with the windings, but certainly not impossible. If all else fails, you can always go to the dealer to have it tested, but also shop locally for automotive electric repair shops and those specializing in starter/alternator repair.
If the regulator is good, then I'd suspect that you have a short to ground somewhere in the system which is causing battery drain. But, realize that even a two yr. old battery can fail. Electrical issues are always a pain to track down, but just use a slow steady approach and you'll find it.
