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Interior lights not working

Tiny
REBELMATT
  • MEMBER
  • 2001 FORD F-150
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 208,000 MILES
Ants and moisture in wiring harness under-hood, no radio, overhead console, interior lights, other intermittent problems. Wanted to know under-dash relay location diagram and circuit description. I have checked and cleaned body ground locations behind kick panels and most visible wiring connectors. I know of two relay boxes on passenger side, and one on driver's side left of A/C control; with at least two each.
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Thursday, November 1st, 2018 AT 1:09 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

I posted the relay and what they control at the bottom.

Here is a guide to help you test it:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Let me know what exact circuits you need to view as there are so many of them.

Roy

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Thursday, November 1st, 2018 AT 1:34 AM
Tiny
REBELMATT
  • MEMBER
  • 4 POSTS
I have the owners manual, so I know the ones in the fuse-boxes, but there are two separate, small relay panels above and behind the glove-box/heater box assembly, etc, and one small relay panel under drivers' side. If I remember correctly, there are at least two relays in each of those panels. Just wanted to make sure what they control (BCM, LCM, pedal adjustment, etc.). I had to fix an older Crown Victoria that would not run years back, was PCM main relay. Was hidden, no books I had been told where it was. An old Ford expert I knew had a book and gave description. Same boat now, just need to know which set controls what. And I will write it in repair guide and owners' manual.
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Thursday, November 1st, 2018 AT 5:07 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Can you see if you have power at fuse #22? Here is the power distribution wiring diagrams so you can see how it works and a guide to show you how to test for power:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

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

Cheers, Ken
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Sunday, November 4th, 2018 AT 10:58 AM
Tiny
REBELMATT
  • MEMBER
  • 4 POSTS
Thanks so much. Hard to get Ford diagrams, especially since the dealer here is unwilling to interact with anyone not employed there.
My acquaintance who is a ford M tech moved to New Mexico and is hard to connect with.
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Sunday, November 4th, 2018 AT 2:25 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Sunday, November 4th, 2018 AT 4:20 PM

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