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Old 11-27-2012, 03:33 AM   #5
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Join Date: May 2008
Location: Downtown Toronto
Posts: 346
Originally Posted by noid View Post
Are you sure it is your battery and not your starter? More specifically your ground that allows for your starter to ground? To test this, take your negative jumper cable and clamp one end to the oil train plug and the other then to the steering rack.

I have had an alternator in my old e30 that would charge but not fast enough if at/around idle. To test this take a volt meter and check the voltage at your power lead at your battery while the car is on, you should see over 13v. It could possible that a diode has gone bad and it is drawing power even when the ignition is off. Thankfully Canadian tire tests alternators for free.

Have you checked the trunk light, glove box, trunk, and interior lights?

Other things to suspect:
Bad relays
Pinched wires

Also see this thread:
Its not the starter. Unfortunately I don't have any electronic testing devices.

The first thing I double and triple checked were all the interior/trunk/glove box lights.
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