Battery dies overnight - Ford Mustang Forum
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post #1 of 4 (permalink) Old 11-24-2016 Thread Starter
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Battery dies overnight

Trying to help my son with his car he just bought. The car battery dies overnight, searched all through the car for a parasitic drain and have found that the shaker amps I the kick panel are staying on and draining the battery. The car had an aftermarket stereo in it when he purchased it thought it might be the harness so bought the PAC C2R-FRD1 harness and rewired it. After having the stereo on and shutting it off you can still hear the front shaker speakers hissing and this only goes away when you unplug the amps. Has anyone had this problem? Could there still be an issue with the wiring? Is it possible to just replace these amps with an aftermarket amp, does not want to put a system in though, just have the better sounding speakers in the door.

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post #2 of 4 (permalink) Old 11-25-2016
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The OEM Shaker amps are turned on and off through a circuit in the OEM head unit, to a relay, to the switch. Somebody has by-passed the head unit when installing the aftermarket stereo, I think.

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post #3 of 4 (permalink) Old 12-11-2016
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If he just bought it, try checking the battery to see how old it is. Normal life of a car battery is 5 years for it to be reliable, especially in cold climates.

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post #4 of 4 (permalink) Old 02-17-2017
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Have you tried leaving the amp unplugged over night to see if the battery is still discharged? If you do and the battery is still dead in the morning, it's probably just an old battery like "yellstang05" mentioned in the previous post. If not then you found the problem and it's most likely due to what "Dana W" mentioned. "Somebody has by-passed the head unit when installing the aftermarket stereo" A possible "quick fix" would be to install a switch to manually turn them off so it doesn't drain the battery. -Dave

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