Question about 1992 Ford F150 SuperCab
You can isolate the new alternator by starting the car and disconnecting the negative battery cable with engine running. Now measure the voltage at the positive terminal to a ground. This will be your alternator voltage under normal load (w/o battery). It should be 14-15 VDC and closer to 15 if it's new. If not, return the new alternator and try again. If the voltage is normal, try touching the negative cable back to the battery terminal and see if it takes it back to 13. If yes, maybe your battery has an internal short.
Posted on Aug 24, 2010
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Posted on Jan 02, 2017
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