Having problems with your Ford F-250 ?

The interior lights keep coming on intermittently, probably from one of the door switches in my crew cab. They are a bear to work on and I thought about locating the wiring for each door and cutting it one by one as a process of elimination. Do you know the color codes or any other suggestions ???

Posted / edited by AnonymousUser on : 20-09-2021

Answers :

Hi there,

The problem is clearly a contact on wiring to light.

As already said, the most common is a contact on wiring inside the door, or between door and chassis, since this get regularly moved and stretched.

To test wiring in there you just do not open and close the door, this will only reveal if a door switch is stuck or broken.
You test wiring inside door using a car voltmeter that can be purchased at any part shop for a couple of dollars. Using the tester you can find out from what point you have voltage, and then replace the defective wiring harness. You may need to remove door panel to do the job, and read voltage before and after door switch connector.

Regarding diagrams, the best thing to do is getting an Haynes manual for your car. This will have also instructions and pictures on how to remove the door panel, and it is a great source for all future repairs, the price is about $20, see Haynes.

Some free wiring diagram can also be found on the Internet , see here a google search, better buying the Workshop manual, it is more accurate.

Do not cut of the wires as that could lead to some other problems.
\015\012Try the following
\015\012Check the fuse box for any blown fuse.
\015\012A shorted door switch would tend to make the light stay on constantly. Check one by one door and find with door is creating the problem check the door switch, replace the door switch. .
\015\012Let me know if you need further asssitance
Repair Help & Product Troubleshooting for Ford F-250

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