Battery drains

Tiny
SAM MEAD
  • MEMBER
  • 1999 HOLDEN COMMODORE
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
  • 189,000 MILES
Can not keep charge in battery's.
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Saturday, January 21st, 2017 AT 1:32 AM

1 Reply

Tiny
STEVE W.
  • EXPERT
Have the battery load tested and have the alternator tested for proper output.
If you have a multimeter or voltmeter you could do a simple test to see if the alternator is actually working. For that connect the meter across the battery terminals with the engine off. You should see 12.6 volts or so on a fully charged battery. Now start the engine and check again. The voltage should be higher now from 13.6 up to 16 or so volts.
https://www.2carpros.com/articles/how-to-check-a-car-alternator

If you mean that the battery goes dead while the car sets overnight, you will need to do a parasitic drain test to determine what is drawing the battery down. That is covered some in
https://www.2carpros.com/articles/car-battery-dead-overnight
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Saturday, January 21st, 2017 AT 3:56 AM

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