Question about 1989 Ford F 150

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When i turn the key off there is something that does not turn off ...there is a low humming... and will run the battery down overnite

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Sounds like a fuel pump. Check under your hood in the fuse box there. Should have a circuit
breaker for many of the items on your truck. Shut off the truck, listen for your hummm and start
unplugging circuit breakers and fuses (Pull one out at a time and replace it if nothing changes) until you pull the one that makes it stop humming. If the under hood fuses/circuit breakers dont indicate what it is, try the in cab fuses. Who knows, it could be the radio! There you have your answer as to what it is. Knowing what it is will help us figure out what to do next to stop it. Please advise us.

Posted on Mar 12, 2011

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Change your blower fan motor is stuck

Posted on Mar 12, 2011

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Hello p dill808
The old fords used to have a problem with the solenoid sticking, The solenoid is on the right fender well, near the battery. While it's humming, open the hood and feel the solenoid for any vibration, or if it's noisy. If so give it a couple of taps on the metal bracket part of the solenoid and that should free it up. Just replace it next time you're out. But if that is not the problem, remove and replace the
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