Headlights won't go off
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Headlights won't go off
2001 F-150 Headlights won't go off when i turn the switch off , all other lights due, this is the first time this has happened , had to pull the headlight fuses to shut the off ?
New User
Joined: Jun 2011
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headlights stay on
Did you find the answer to why your headlights are staying on? My truck is now doing the same thing!!
I have a 2002 F-150 Supercrew with the 5.4 liter engine, and my lights turned on, “ON THEIR OWN”, with the light switch in the OFF position, while I was sitting in the truck with the engine running. This happened about 15 minutes after I had jumped off someone with a dead battery. My truck does not have Daytime Running Lights, so this should not be due to a faulty DRL module. The lights stay on all the time, even with the engine off, light switch in off position, and key removed. The only way I can get the lights to go off is to disconnect the battery. So far, I have tested these things:
- Cycled light switch multiple times, headlights still on
- Battery voltage is 12.7 volts while not running
- Alternator is putting out 14.38 volts when running, so is not for lack of power not driving a relay somewhere
- Removed wire from rearview mirror light-dimming feature, replaced and selected “off”, no difference, has power to mirror
- Checked “every” below-dash fuse, and tapped relays (did not know how to check them)
- Checked “every” engine-bay fuse, and tapped relays (did not know how to check them)
- Removed light switch from dash wiring harness, headlights still on with no light switch installed
- Wires running to light switch and to fuse block do not appear to be melted or overheated
- Lights do go out when I remove the engine-bay fuse #3 (main light switch)
- Lights do go out when I remove the below-dash fuse #26 (Right side low beam headlight)
- However, the lights DO NOT go out when I remove the below-dash fuse #28 (Left side low beam headlight)
1. Why would the lights go out when I remove fuse #26 but not on fuse #28? Does one fuse feed the other?
2. Can I easily pull out the fuseblock to check wires and connections behind it?
3. What wire location and pin-out should I be testing next to track down the source, assuming it is a crossed or melted wire?
Please feel free to email me directly at my crackberry at: dell.west@honeywell.com<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com
fficeffice" /><o
></o>
I have a 2002 F-150 Supercrew with the 5.4 liter engine, and my lights turned on, “ON THEIR OWN”, with the light switch in the OFF position, while I was sitting in the truck with the engine running. This happened about 15 minutes after I had jumped off someone with a dead battery. My truck does not have Daytime Running Lights, so this should not be due to a faulty DRL module. The lights stay on all the time, even with the engine off, light switch in off position, and key removed. The only way I can get the lights to go off is to disconnect the battery. So far, I have tested these things:
- Cycled light switch multiple times, headlights still on
- Battery voltage is 12.7 volts while not running
- Alternator is putting out 14.38 volts when running, so is not for lack of power not driving a relay somewhere
- Removed wire from rearview mirror light-dimming feature, replaced and selected “off”, no difference, has power to mirror
- Checked “every” below-dash fuse, and tapped relays (did not know how to check them)
- Checked “every” engine-bay fuse, and tapped relays (did not know how to check them)
- Removed light switch from dash wiring harness, headlights still on with no light switch installed
- Wires running to light switch and to fuse block do not appear to be melted or overheated
- Lights do go out when I remove the engine-bay fuse #3 (main light switch)
- Lights do go out when I remove the below-dash fuse #26 (Right side low beam headlight)
- However, the lights DO NOT go out when I remove the below-dash fuse #28 (Left side low beam headlight)
1. Why would the lights go out when I remove fuse #26 but not on fuse #28? Does one fuse feed the other?
2. Can I easily pull out the fuseblock to check wires and connections behind it?
3. What wire location and pin-out should I be testing next to track down the source, assuming it is a crossed or melted wire?
Please feel free to email me directly at my crackberry at: dell.west@honeywell.com<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com
fficeffice" /><o></o>
New User
Joined: Jul 2010
Posts: 24
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From: Knoxville, TN
Is it your high beams or your low beams that are on? If it is the high beams, maybe it could be you multifunction switch. Attached is the wiring diagram for the headlight circuit if that helps you out at all.
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New User
Joined: Jun 2011
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It's my low beams and all parking lights that are affected. My high beams still operate with the mulitfunction switch. Thanks for the diagram. I will definitly print it and use it. Dell
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Joined: Apr 2017
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Hello Dell. I realize your post is almost 6 years old, but did you ever find a solution to your problem? I recently bought a used 2002 F-150 and am now experiencing the same exact issue! I disconnected the battery as my temporary solution. Please let me know what you found. Feel free to email me directly at camgarrett@yahoo.com.
Thank you!
Thank you!
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