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Re: new alternator not charging on 93 gmc pick up
Ok. Then your problem is more-than-likely a wiring issue.
Track the wires between the alternator and battery. Carefully disconnect the connectors, clean them and make sure they are re-attached securely. Check the wires as your track them. Make sure they are not frayed or otherwise damaged. Remove your battery cables. Clean them, check the connectors (this is probably where your problem lies) and make sure they are connected securely.
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either that cable going to the battery is shorted to ground somewhere (maybe on the body of the alternator) or the alternator is defective. there is a chance that you put one of the wires wrong on the alternator and you are forcing it into full field mode. that is a mode we use to test the full output of an alternator. if an alternator stays on full field too long (more than ten seconds) it could fail.
After you get the truck started disconect you battery cable and see if the truck continuse to run. if it dies you are having a problem with the charging system. make sure dont have any interior lighs left on.
I need more info for your problem. Never should an alternator charge over 13.8 and they will charge less depending on demand. As long as the battery voltage is above 11.5 volts the car is probably within min operating specifications.
The alternator output is regulated by the ECM (electronic control module). Check the wiring between the alternator field circuit and the ECM; if the wire and connectors ar4e okay you MAY need to replace the ECM.