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Rear Brake and turn signal lights are not working?

Tiny
ALSTON RAASCROCK
  • MEMBER
  • 2005 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 246,794 MILES
The high mount light is working.

I changed all the bulbs (3157) rear stop and signal bulbs.

I checked the fuse 2 and 18 both look good but replaced it

I checked the brake socket with a voltage meter, and it read 7.9 volts.

I turned on the turn signal and went back to the socket, but no current was coming through the wire.

The red light that illuminates when you open the door isn’t lighting, may be the bulbs.

I also pierced the wire on the turn signal to see if any power is coming thru the wire “no beep” on the voltage checker.

Please help
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Wednesday, August 16th, 2023 AT 1:02 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
It sounds like the multifunction switch has gone bad. But to be sure let's test for power through it. here is a guide that will help and the brake light and blinker wiring diagrams so you can see which wires to test and how the system works.

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

this guide may help as well:

https://www.2carpros.com/articles/brake-lights-not-working

Here is how to replace the multifunction switch in case you need it. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

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Wednesday, August 16th, 2023 AT 4:41 PM
Tiny
ALSTON RAASCROCK
  • MEMBER
  • 3 POSTS
I got the bulbs working again, thanks to you.
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Monday, September 4th, 2023 AT 7:02 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Way cool, can you tell me what the problem was?
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Tuesday, September 5th, 2023 AT 10:42 AM

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