Alternator should be plugging out 13.5 to 14 volts. Who ever installed that alternator needs to check the connections or the alternator itself.
The issue was where a previous owner had tried to replace a portion of the wire from the alternator to the battery. They used what looked to be a power wire for a subwoofer hook-up. Replaced that portion with 4 gauge terminal wire from the auto parts store. Soldered it in place and retested. The system checks good no issues now
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SOURCE: good alt. will not charge good battery
the regulator should be in the alternator,is it a rebuilt one,if so you could have gotten a bum one, i'v had that happen to me three times in a row till i finaly got a good one, also make shure the ground wier is tite and none of the wiers are frayed or broken
SOURCE: battery light on tested bat and alt both good light still on
The alternator can check good,but it may have a blown diode in the alternator,and causing the light to come on,the test may not catch the flaw,so think about it,it will get worse,if there is not a drain on the voltage system,there will be.
SOURCE: my 2004 f350 diesel is
Possible that the alternator or the electronic charging unit has failed. You need to start and check the battery voltage with the car running and reving. check this link for tips: http://www.fixya.com/cars/r5824824-draining_car_battery_charge
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