Weak/Dead Battery after drive
Thread Starter
Racer
Joined: Dec 2003
Posts: 275
Likes: 6
From: NY
Weak/Dead Battery after drive
Alt is not recharging the battery. I read 13.85V at the + terminal of the battery and at the Bat + on the Alt. Revving the eng gets no change at either terminal. My service manual says that there is a large resistance between No 2 term. on the Alt to ground. I read 14.8K. Thats not large. Any one know what I should read from pin 2 to ground on a GM alt? Thanks
Thread Starter
Racer
Joined: Dec 2003
Posts: 275
Likes: 6
From: NY
6'rr...... I read 13.8 with engine running at both the battery + and the bat+ out of the alt. The true check is current based. The max load is stamped on the alt SOMEWHERE below I can't see it . Another way to think about this is from the Alt rather the Battery. If cell[s] were shorted the bat is toast and won't recharge. This battery accepts a charge.
Last edited by sjr1971; May 30, 2008 at 09:42 PM.
Le Mans Master
Joined: Jan 2006
Posts: 9,192
Likes: 27
From: Boca Raton Florida
The battery accepts a charge from an external source, like a battery charger?
If so, then there is something strange going on. It doesn't matter what the current rating is on the alternator. If you have 13.8+ volts at the battery with the engine up off idle it SHOULD be taking a charge.
My car is wired with a ground and a power wire from the alternatoe directly to the battery. Check all the connections to and from the battery closely.
Where exactly did you have the meter probes on the battery?
If so, then there is something strange going on. It doesn't matter what the current rating is on the alternator. If you have 13.8+ volts at the battery with the engine up off idle it SHOULD be taking a charge.
My car is wired with a ground and a power wire from the alternatoe directly to the battery. Check all the connections to and from the battery closely.
Where exactly did you have the meter probes on the battery?
