Topic: brake lights not working
in Forum: C3 Electrical




The turn signals, brake lights, and 4 way flashers on the rear of the car are all the same bulbs and wires.
A yellow wire supplies the left side, a green on supplies the right side.
The brake light feeds the turn signal switch. The 4 way feeds the turn signal switch, and turn signal flasher power feeds the turn signal switch.
From there, the switch splits up the circuits. The brake lights are the default position in the switch. When the turn signal is turned on, the brake light feed is disconnected and the turn signal flasher is connected to both front and rear lights on that side. The 4 way overrides everything.
Your passenger side works t/s works, so the bulb and wire is good there. The driver side 4 way works, so the wire and bulb is good there. This means you do in fact have a problem with the Turn signal switch. Check the wire connections at the base of the column where the switch connects. If all is good, it sound like you have a bad switch. I would be cautious about crossed or shorted wires due to the fire. Crossed, shorted wires can do some weird things.
