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1997 grand marquis has same problem Tonight I found the head and tail light and interior light on. Light switch was in automatic on/ off. Key was off. Turned off Light switch from auto to off and lights went off. twice in the past week have had dead bat in morning. Hope that it is fixed.

check and make sure it is charging the battery, should be between 13 and 14 vlots when car is running. if less you have a wire not getting power from the alternator to the battery.

If you have power windows, try checking the wiring and motor for that. When a power window motor is bad or the wiring has a short in it, it can run continuously even with the car off causing the battery to be drained. If that checks out fine, check other automatic devices in your vehicle. There are a number of them that could be malfunctioning and be absorbing too much power from the battery. a little.

Somewhere in the car is a load that is killing the battery. If you have had any electical work done recently you should be returning to have it looked at. It could be a bad motor somewhere (antenna motor, window motor, blower motor). You can disconnect the negative terminal from the battery until you get it fixed. It won't hurt anything.

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Q: If the battery keeps dying every few days and the new one does the same and the alternator is OK is there a short somewhere?
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