Re: Battery Drain puzzle - Saab 900 Bulletin Board - Saabnet.com
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Re: Battery Drain puzzle
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Posted by RS [Email] (#15) [Profile/Gallery] (more from RS) on Fri, 30 Oct 2015 05:57:16 Share Post by Email
In Reply to: Battery Drain puzzle, EverettDave [Profile/Gallery] , Fri, 30 Oct 2015 01:09:12
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Sounds like it might not be charging properly.

It's often one of 2 issues:

- The ground wire between the alternator and the engine or body that's the issue - they get frayed and don't conduct as well as they should.

or

- Voltage regulator

When you replaced the brushes, did you solder new brushes into the old voltage regulator or did you put in a new voltage regulator. If you replaced the whole voltage regulator unit, is the new one a Bosch unit or an aftermarket unit?

With the car running, check the voltage between the battery terminals. It should be around 14.3 bolts is the voltage regulator is working properly.

I recently had a similar problem with my '90. It had a Chinese-rebuilt alternator but the battery was draining after a few days. Turned out that the voltage regulator they'd used was bad. Same thing happened to Poop Deck Pappy on this board - rebuilt alternator with a bad voltage regulator.

I usually run a #10 or thicker cable between the upper clamping bolt on the alternator and the A/C compressor to make sure that there's a good path from the alternator to ground.

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