Power Fuse Automotive
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 150 AMP ANL Power Fuse Automotive Car Audio 150A US $2.95 
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Can a short circuit in a car's wiring cause a dead battery in the morning?
Recently, the fuse for our power door locks in our car has been blowing out on a regular basis. We finally stopped worrying about it and just started operating the locks manually and leaving the fuse pulled out.
Can this cause a drain on our car's battery if the fuse is pulled out? I mean, isn't the fuse there to make sure no current is going the wrong direction? Pardon my ignorance on this one, but I know nothing about automotive wiring.
It's time you went to a repair shop that specializes in vehicle electrical. Make sure they can perform a "parasitic battery draw" test on your battery to find what's drawing excessive current from your battery. The normal parasitic draw should be less than 1/4 ampere when the car is parked overnight. However, if your battery is over 5 years old, I'd definitely replace it because it's probably not holding a charge too well and may be draining down more than it should when the car's parked. If you live where a cold winter might be coming, now's a good time to replace an old battery.
http://www.wikihow.com/Find-a-Parasitic-Battery-Drain
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