I replaced this battery maybe 2 yrs ago. Here's what I tried:
1. With car running, the voltage across the battery is 13.8. That seems fine I think. I measured voltage drop across the ground strap; the drop there is not excessive, perhaps 10 mV.
2. With car not running and no load, the battery voltage is 12.8. Turning the headlamps on drops the voltage to 11.8. I left the headlights on for about a minute, then off. Now the battery voltage is 12.25.
3. I disconnect the negative terminal and put the current meter across the terminal, and what happens completely baffles me. When I first touch the meter to the terminal, it shows just over 1 amp current; but when I hold the meter on the terminals, within 10 seconds the leakage current is down to 6 mA. I did it time and again and it did this consistently
Because of the voltage drop under load I'd guess the battery is bad; but that current thing baffles me. Any ideas?
2007-04-21
08:33:55
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3 answers
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asked by
Gary B
5