Car Batteries
Ford F-150

What would cause a battery drain on a 1991 F-150?


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Wiki User
2004-11-29 06:37:41
2004-11-29 06:37:41

Shorted diodes in the alternator.


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The drain hose is connected to a nipple underneath the battery tray.

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Dead cell in the battery requiring it be replaced or something is on pulling power from the battery. Some light or relay.

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Possible the battery is just too old, or it is damaged.

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Often it's an alternator diode. Check the battery first. When batteries start to go bad they can often start to discharge over a couple hours. Take it to an auto parts retailer and have them test the battery and alternator for you. I had the same problem with my '92 Windom (ES 300). It was a faulty trunk mounted CD changer that was draining the battery.

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