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Back away from the car slowly and put your hands on the roof..... 700 1987

posted by  JohnBin on  Tue Mar 5 06:55 CST 2002
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OK, I'm going to break a cardinal rule and tell you how to get in trouble...

Set the multimeter up for dc voltage on a scale that covers at least 15 volts...it's probably 2-20 or some such weird range although it might be different..the idea is to avoid pinning the meter or getting a 'high' or 'low' readout on a digital. Do NOT use the ammeter or ohmeter scale.

With the engine off, put the probes from the multimeter on the plus and minus poles of the battery...the voltmeter should read above 12.8v or so on a charged battery. Start the engine...the voltmeter should read 13.2 or better but less than 14v. If it doesn't go up from the voltage you read with engine off the voltage regulator is most likely bad although it's possible the alternator has a shorted or open diode in the diode bridge (takes another tester to find the unrectified voltage).






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