will bad coil cause battery to drain

Asked by Carla N Ray Nov 29, 2016 at 08:00 PM about the 2006 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

4 Answers

F_O_R answered 7 years ago

I doubt it. With the ignition off there should not be any power going to the coil.

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lrodri911 answered 7 years ago

Yes, I believe yours is always hot to one side of coil and computer turns on and off the negative side, so if your is grounding, it will stay on. Check with ignition switch turned off and see if you get 12 volts at the coil. You shouldn't, if it's working correctly

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F_O_R answered 7 years ago

I have had a dozen or so bad coils on my Triton engines and never a fault like that.

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Trippmeister answered 7 years ago

Google on You Tube "parasitic draw test". tons of instructions on how to find it with a multimeter. Could be alternator, or a zillion other things.

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