Datsun 720 pickup

Asked by Feb 14, 2016 at 05:49 PM

Question type: Maintenance & Repair

My 82 720 pickup is having an electric problem! I've
replaced the alternator 4 times and my battery light still
comes on and kills my battery eventually. The voltage
regulator is built into the alternator so I don't think it's that
the alternator passed the test at the shop. Help!

6 Answers


Sound like you have a shorted out battery. When the vehicle is running put a volt meter across the battery to see if there is 14.7 DCV. It there is then the alternator is working.

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The alternator is good but when I hook that up its not jumping up when I crank it which would seem the alternator is bad but maybe a wire somewhere?


You never know, but I would have the battery tested.

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Best Answer Mark helpful

Ok thanks so much

Got new battery and my battery lite still on


Have the alternator load check to see if it putting out enough volts...

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