Interior lights not working properly

SPARKY ENGLAND

MEMBER
2004 FORD F-150
5.4L
V8
4WD
AUTOMATIC
260,000 MILES

For no apparent reason interior lights go on every once and awhile.
I get them to go off I just smack the left side of dash above light switch and they of out. Or turn the dimmer off.

Sunday, February 3rd, 2019 AT 7:22 AM

6 Replies

KEN L

MASTER CERTIFIED MECHANIC
43,110 POSTS

Hello,

It sounds like it could be the instrument cluster. here is a wiring diagrams so you can see how the system works. also see if pulling the battery saver relay helps. Here is a video of a cluster being removed for rebuild in a similar car the process is the same and the relay location below:

https://youtu.be/_HEC44xENxw

Check out the diagrams (below). Please let us know what happens.

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Monday, February 4th, 2019 AT 11:55 AM

SPARKY ENGLAND

MEMBER
4 POSTS

Thanks. I'll give it a try. You don't think it's the light switch assembly?

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Tuesday, February 5th, 2019 AT 4:17 PM

KEN L

MASTER CERTIFIED MECHANIC
43,110 POSTS

I have not seen a switch fail that way but there is always a first time. Try unplugging the switch to see if it stops. Check out the diagrams (below). Please let us know what happens.

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Wednesday, February 6th, 2019 AT 11:48 AM

SPARKY ENGLAND

MEMBER
4 POSTS

Same thing, I was told the instrument cluster would control the brake light and the dome lights along with a lot of other devices. Is this true?

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Thursday, February 7th, 2019 AT 4:05 PM

KEN L

MASTER CERTIFIED MECHANIC
43,110 POSTS

That is correct. Here is a wiring diagrams of the cluster so you can see how it works and what it controls.

Check out the diagrams (below). Please let us know what happens.

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