power loss in 850 GLT

lilblondie335 · Post by **lilblondie335** » 05 Jun 2005, 21:30

My battery does not seem to be holding a charge and I can not figure out why. I will jump the car and drive it for about an hour and everything runs fine for about three days. On the third day I will attempt to start my car and after one failed crank the power is gone. I already replaced the battery and my alternator a year ago and had a stress test done last week. The battery was working fine and the terminals are secure and clean. What is causing my problem?

Jot · Post by **Jot** » 06 Jun 2005, 07:31

Your glove box light or trunk light

Da' Moose · Post by **Da' Moose** » 10 Jun 2005, 23:05

I had a problem that sounds kind of like yours.

After much searching and looking about I found that my Alt. was the problem, the brush pack to be exact. I am still running the same Alt, but I have replaced the brush pack.

I would start fine one day and drive the car around town and all was well. Then out of the blue I would get not a thing out of my starter. If I would give it a jump or put it on my charger for a few minutes it would start right up, and run for a few days just fine and then have the same problem again.

After looking through my starter and starting circuits, finding that all was well and tested out good out of the car, I looked at my battery voltage. When the car was off and I took a reading it looked fine. Then I would start the car and test the battery voltage again, it would climb to 13-14volts. Now this kind of voltage is just a bit low but it will get the job done to charge the battery. The kicker is when I did a load test on the charging system, just by turning on everything on in the car; lights, radio, flashers, AC, rear window defroster, ect