Question about 1998 Ford Expedition

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BATTERY DIES IF NOT STARTED EVERY DAY AND POWER TO WINDOWS IS ALWAYS ON EVEN WHEN KEY IS NOT ON OR IN IGNITION

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  • Master
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Hi and welcome to Fixya.

If you still on your origninal battery then it is well past time for a new battery. It is quite possible the battery has a dead cell and is internally discharging the battery. You can prove this by disconnecting a battery terminal over night but do the terminal disconnection immediately after the last use of the day. In the morning reconnect the terminal.... If the battery is dead you know you need a new battery. If it has a full charge in then there is a short somewhere in the chassis of the auto that will have to be located and repaired.

Based on your window power always on... it sounds like you have a bad window switch in one of the door panels or a short in one of the wires. Pull the fuse for the power windows until you are able to fix it. Window drive electric motors take a substantial amount of amperage to run or attempt to run and yes if you have either a switch problem or a window drive motor wiring problem it will drain your battery in just a few short hours. Honestly I am surprized that the fuse for the power windows has not blown. Having a switch made all the time will cause the motor and the wiring to heat up and eventually blow the fuse.

Kelly

Posted on Feb 07, 2010

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  • Ford Master
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If there is power to accessories that should only be powered when the ignition is on, I would suspect the ignition switch. Try pulling the plug off the back of the switch, and see if the windows lose power. If so, then the ignition switch is the problem.

If there is something on all the time, a voltmeter or test light between one of the battery terminals and a battery cable that you removed, will show it. (You need to discount extremely small draws, like the clock, so an ammeter can be useful as well. But a test light actually show voltage and amperage somewhat.)
If you do find something draining, then you can disconnect things, such as pulling fuses one at a time, until it goes away. For example, an alternator with a bad diode can drain the battery.

Posted on Feb 12, 2010

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