I have a 2003 ford f150 xlt and one day all brake lights stopped working all three and I've checked all the fuses and they are good and I've even changed the brake switch still nothing

Asked by Feb 03, 2015 at 10:13 PM about the 2003 Ford F-150 XLT Extended Cab LB

Question type: Maintenance & Repair

I have after market taillights they have one
bulb (brake) and a reverse light and my turn
signal still works as in they get bright like it
would when I put on the brakes

1 Answer

95,265

Unplug the brake light switch and test for power, if you have power jumper the connector and look too see if the brake lights now work, if they do you either have a defective brake light switch or it is adjusted wrong, if you don't then try turning on and off the 4 way switch a few times you may have turn signal switch that is not completing the circuit when the signals are off so no brake lights. If you don't have power to the brake light switch then check the fuse and wiring to the brake light switch connector. If it is blown then you need to find out why it blew ie shorted wiring, shorted sockets, cross connected lamps etc. HTH

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