1992 Pontiac Bonneville charging

Tiny
PSOPIARZ
  • MEMBER
  • 1992 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 12,000 MILES
We have had the battery and alternator checked and both are fine but when driving the vehicle the gauge goes low and lights get dim
Sunday, November 8th, 2009 AT 1:23 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, were the systems checked on or off the vehicle? With everything turned off use a digital volmeter across the battery post. A full charge is around 12.6 volts. Then start the engine, take another reading across the battery posts, the second reading should be a volt higher than the first, that shows the charging system is working.
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Sunday, November 8th, 2009 AT 2:42 PM

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