Question about 2008 Subaru Outback
I replaced the dead battery. Both AAA tech and auto shop manager measured a "parasitic drain" of 1.85 Amps draining the battery, including the brand new battery. What's causing the drain?
Posted by Anonymous on
Seen this "mystery drain" many times. Check spark at the battery to see how big the drain is. For this simple test, blow away any (explosive) battery charging fumes. Leave one terminal on and gently touch the other to its post in fairly dark surroundings. Then try it again with the wires taken off the alternator. Your spark is now probably much less. Usually bad diodes leaking electricity backwards through the alternator cause this drain. Replace the alternator or the diode pack inside it. Some mechanics recommend actually measuring the drain.... hahaha. OK whatever.
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Posted on Jan 02, 2017
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