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Old 09-17-2011, 10:10 PM   #6
steve.325i
2nd Gear Member
 
Join Date: Feb 2010
Location: Brampton Ontario
Posts: 98
Stereos can be pretty bad for this if they are not wired properly. Especially when there is a seperate amp involved. Amps and HU's (assuming aftermarket) have two power inputs - constant & switched. If these are mixed, the wrong parts can be kept alive and drain the battery. Even if just the amp is wired wrong, it can reverse power the HU for a double wammy.
Also remember (well in my 325 anyway) that there is no switched power to the HU. It's live all the time.
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