Ford - Ranger :: Battery Light Coming On Each Time When Stopped At A Red Light


Feb 27, 2011

94 ford ranger, 4.0L OHC, 4x4 5 speed manual 146,000 ....

So the other day I was driving home and i noticed my battery light was coming on each time i stopped at a red light. Soon after it remained on regardless and the voltage gauge started to drop till it hovered right at the "N" in normal but thinking if my alternator had gone i was best to keep driving rather than having to stop and restart the car again. I shut the radio off and made it home. The next day i grabbed my haynes manual and started going through all the tests of the charging system and everything checked out.

The battery had a full 12.8v at rest and when idling showed 14.3, whats going on? The car didn't have a problem starting the next day and the battery, even now another day later, has a solid 12.8 on it so I don't suspect a drain anywhere. The only thing that i notice is when i tested the resistance on the voltage regulator the manual calls for at least 2.4ohms and mine read 4.0ohms, is that normal? Could it just be that my actual gauge is bad and i am getting a false reading? My only other thought here is maybe the drive belt is a little loose and its slipping when the alternator is under load, but I don't hear a squeal and when i measure the deflection between the alternator and powers steering pump i get a little less than a 1/2".

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