Kills battery

Asked by Aug 12, 2019 at 11:06 AM about the 1977 Ford F-100

Question type: Maintenance & Repair

I got a 1977 ford f100 i fixed the harness n
changed all the ignition parts n it still my
battery even with a kill switch on

1 Answer


If the battery is older and the vehicle sits for weeks at a time replace the battery. Do you have an aftermarket stereo? If so make sure the entire system is off when you shut off the ignition. If you have any aftermarket accessories make sure they power down when the ignition is off. You can also do this. Remove the positive battery cable and hook up a 12 volt DC test light in between the battery terminal and the disconnected battery cable. If anything is drawing power the test light will glow. Start removing and reinstalling fuses one by one until the test light goes off. Then you'll have it narrowed down to the circuit. Then check each component on that circuit. Hope that helps! Jim

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