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yeah...load test your battery.
Posted by JohnB (more from JohnB) on Fri, 3 Nov 2006 06:23:29
In Reply to: found my battery drain, Fing, Thu, 2 Nov 2006 20:17:42
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If a trunk light kills your battery within 24 hours, chances are the battery is on its last legs. It should have a minimum 20-25 amp-hour reserve/drain before it won't start your engine.
If you don't have a load tester, just hook up a voltmeter to the battery and turn on your lights (engine off) and check the voltage every ten minutes to see if it stays above 12v. It should hold the headlights for an hour or more.
Figure two 55w headlights and a half-dozen 5w bulbs or maybe 150w /12v or call it 13amps for one hour ergo a 13-15 amp-hour drain. A good battery should even go two hours.
posted by 68.55.24...
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