Battery drains and battery light comes on while driving

Tiny
DONNA EXUM
  • MEMBER
  • 2000 FORD RANGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
When driving the battery drains and battery light comes on. Had alternator checked and that was not problem.
Thursday, January 12th, 2017 AT 4:40 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
Something was overlooked because if the generator is working, the "Battery" light would not be on.

Use a digital voltmeter to measure the battery's voltage while the engine is running. It must be between 13.75 and 14.75 volts. If it is low, we will need to measure the voltages on the smaller wires in the plug at the rear of the generator.
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Thursday, January 12th, 2017 AT 4:47 PM

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