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Alternator not charging battery

Tiny
DANIEL JAY
  • MEMBER
  • 1978 FORD LTD
  • V8
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
New battery, new alternater, new voltage regulator, car cranks and runs perfect for about 30 min battrry goes dead, put on the lights car kills hold the brakes the car kills
Monday, March 27th, 2017 AT 9:27 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Start by measuring the battery voltage, first with the engine off, then with it running. Do that after charging the battery at a slow rate for at least an hour. Tell me what you find.
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Monday, March 27th, 2017 AT 3:11 PM

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