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Car won't start with own battery, runs fine once boosted.

Tiny
KAISO
  • MEMBER
  • 1991 BUICK PARK AVENUE
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
1991
Buick Park Avenue
Engine size: Do not know
~180k km

The battery doesn't (appear to) hold a charge large enough to start the car after it's been turned off. Starts fine with a boost. Two batteries tested with same result. Car has driven 30+ minutes with lights/radio on with same result after it is turned off.
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Tuesday, July 5th, 2011 AT 4:00 AM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have the alternator load tested if okay check and test the starter motor
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Tuesday, July 5th, 2011 AT 4:22 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Road test battery after a full bench charge, this will show up a faulty battery or not.
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Tuesday, July 5th, 2011 AT 4:44 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Get a voltmeter and read the battery voltage before you start it- and while engine is idling. If you have 13.5 -15.5 volts the alty is doing its job-comeback with the readings
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Tuesday, July 5th, 2011 AT 4:47 AM
Tiny
DANLESABRE
  • MEMBER
  • 230 POSTS
Are the battery terminals tight? Can you wiggle them by hand?
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Tuesday, July 5th, 2011 AT 4:48 AM

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