Date: Thu, 21 Aug 2003 09:07:23 +0100
From: Grunff <>
Subject: Re: Battery question -- 1995 9000CS

LauraK wrote: > Sigh. Seems to be my year for bad alternators. > That was the first time I'd seen it dip below 13 which is why I had it checked > and why I was worried about it. > I'll have them take a look at it when it goes in for an oil change/check up in > the next few days. Laura, if you have access to a voltmeter it's pretty easy to test it yourself. Connect the voltmeter across the battery with the engine running. At idle, with no electric toys on (lights, cabin fan, rear window heater etc.) you should get over 13.5V. If you rev the engine, this should go up a little, maybe as high as 14.5, but no higher. Now switch on all your electric stuff. The voltage will drop, but at idle it shouldn't drop below 13V. Rev the engine - it should go up to 13.5 or more. If you get voltages lower than the above values, then it's likely your alternator brushes are worn. -- Grunff

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