Re: Battery going dead

Posted by HH56 On 2008/11/1 22:07:57

Unless you have a defective battery, there has to be a current drain somewhere.

Not knowing if your car has one, a common place for a slow drain in later cars is the trunk light. If you have no trunk light, then any small light staying on will draw in the 2-300 mA range and can drain the battery over a week or two.

If the mechanic didn't check with a meter capable of reading down to milliamps, he would never see that small a drain with regular garage equipment. A suggestion would be to get a Volt-Ohm meter capable of reading 5-10 amps. Pull a battery cable and place the meter in series. Just be sure nothing is knowingly on when you connect because any large load (headlights, radio, etc) will damage the meter.