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Batt Light Not Working But It Does! 200

posted by  81242DLB21FCA on  Mon Mar 18 17:16 CST 2013
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last visit: Thu Oct 23 22:26 CST 2014
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Hi All,

It’s an '81 242DL B21F with external regulator. The alternator has been changed several times through out the cars life (I've owned it since '86) and it's the original style small 70-80 Amp (?).

Yesterday my voltmeter suddenly showed 10-11 volts after driving for half an hour. The Batt light never came on but it works when I just turn the key on.

I measured at the battery and the alternator's output terminal and got about 11 1/2 volts for both with the engine running. I then tried removing the regulator and jumped D+ to DF at the plug. This gave About 15 Volts at the battery with engine running. I replaced the regulator with a PnP unit, which seemed to fix it. My voltmeter read about 13 Volts. The next day, after a short drive, my voltmeter again dropped to 10-11 Volts.

So, is the alternator blowing regulators and why isn't the Batt light coming on?





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New Batt Light Not Working But It Does! [200]
posted by  81242DLB21FCA  on Mon Mar 18 17:16 CST 2013 >


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