86 f-150
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86 f-150
Hey guys I have an 86 F-150 2wd single cab long bed. I’m having a problem with the lighting in the rear of the truck. Everything works fine until you have the lights on and use the turn signal or flashers, then the tail lights and license plate light go out but turn signals will work once lights are turned off. I’ve checked fuses and they were all good. I don’t know what else it could be. Any help would be greatly appreciated. Thanks
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
It's a ground issue.
You need to check all grounds from battery on down to lights.
There is ground from battery to motor & frame.
One from motor to firewall in the engine bay..
Each head light and turn/ part light has grounds to each inner fender.
I think the 1 you are after is in the cab on the firewall by the radio.
I would also pull each rear light and bulbs to check and clean there too.
Dave ----
You need to check all grounds from battery on down to lights.
There is ground from battery to motor & frame.
One from motor to firewall in the engine bay..
Each head light and turn/ part light has grounds to each inner fender.
I think the 1 you are after is in the cab on the firewall by the radio.
I would also pull each rear light and bulbs to check and clean there too.
Dave ----
Lead Driver
Joined: Nov 2013
Posts: 7,174
Likes: 1,174
Here's a troubleshooting guide that should help:
https://www.ford-trucks.com/forums/1...ing-guide.html
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New User
Joined: Mar 2022
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Here's a troubleshooting guide that should help:
https://www.ford-trucks.com/forums/1...ing-guide.html
https://www.ford-trucks.com/forums/1...ing-guide.html
thank you that’s exactly what I been looking for
Laughing Gas
Joined: Nov 2013
Posts: 1,022
Likes: 79
From: A dirty little town in OR
Here's a troubleshooting guide that should help:
https://www.ford-trucks.com/forums/1...ing-guide.html
https://www.ford-trucks.com/forums/1...ing-guide.html
Also to check/clean bulb bases and sockets.
This link (which l just sent him) makes me look like l knew what l was talking about.
The subterfuge continues.
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