Brake, tail, reverse running lights not working


Asked by Sbmercer Dec 10, 2018 at 10:10 PM about the 2005 Ford F-150 FX4 4WD

Question type: Maintenance & Repair

All of my lights were working and when they stopped working properly i had
no tail lights, daytime running lights, no reverse lights and no brake lights.  
My signal lights would work in the front ( both left and right) independently
but blink really fast as if I have a blown bulb. (Checked all bulbs and all
good) While the signal lights are turned on in the rear they both come on
together and also blink really fast.  I have disconnected the connector above
the spare tire to isolate the rear end.  When disconnected i still have the
same problem with my front signal lights.  do anyone know if there is
another common junction point or lighting module that I could check. Thks
in advance!

3 Answers


You probably have a bad ground or power wire somewhere. The controller normally blinks fast where a bulb is burned out and it detects twice the current being supplied because one wire is out. Check the net for further info on why signals blink fast. A color coded wiring diagram is helpful here. Keep checking backward for power at the wire until you either hit the controller or the fuse box.

1 people found this helpful.

.....Because one bulb is out, not wire.

1 people found this helpful.

Hey I found the problem...on the 2005 model ....and possibly other older trucks .. there is 2 connectors for that main harness hidden behind a black plastic cover and caked in dirt! Removed the cover and cleaned up the dirt and the connectors..... found a couple corroded pins.... after everything cleaned up, put back together... tested lights and everything worked!

1 people found this helpful.

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