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EGeezer
zichrona livracha
Premium
join:2002-08-04
Midwest
kudos:8
Reviews:
·Callcentric
reply to fartness

Re: Do I need a new battery?

said by fartness:

A little more detail. It's only happening when I hit the brake when I'm stopped.

It's also reasonably possible (but not probable IMO) that a brake light bulb may be shorting out. Bulbs are cheap - replace both brake light bulbs and see if the problem goes away.
--
Buckle Up. It makes it harder for the aliens to suck you out of your car.


cowboyro
Premium
join:2000-10-11
Shelton, CT
Reviews:
·AT&T U-Verse

said by EGeezer:

It's also reasonably possible (but not probable IMO) that a brake light bulb may be shorting out.

Then the fuse would blow.

The voltage drops when the brakes are hit and the car is stopped because:
1. The alternator produces less current at idle speed
2. The brake lights are a fairly high drain (2x25W give or take)
3. The battery is weak

It isn't impossible for the alternator to have a problem (blown diode), but that is difficult to test without proper equipment and without removing the module. It is far more likely for a 5yr old battery to be weak.