My mustang battery keeps dying, I brought the alternator in and said it was fine. Looks like someone hooked up there own alarm system to it from the ignition could that be the cause on the drain of the battery?
There's many ways to have a slow draw on the battery (I know, I've had one for 15+ years and can't find it myself), but the alarm could be doing it if it wasn't installed properly. Check it out and rewire it if you have to.
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