Volvo 240 Tail light problem

volvo
lights

#1

Hi all, I am in the midst of fixing my '89 Volvo 240 sedan. While fixing the brake lights I noticed on one side (the passenger side)the dual filament bulb stays full-on bright as if the brake pedal was pressed whereas the driverside brakelight is fine. If I move the socket just right the light will dim to normal running brightness however when the brake pedal is pressed the light goes out all together. I am using the proper socket, a 3 pronged white socket and the proper dual filament bulb so i am confused as to what is wrong. If there are any other volvo people out there who could help me out id appreciate it very much. Thank you very much.



-N


#2

I’m not saying you don’t know how to insert a bulb properly, but, it is easy to insert it backwards. Doing this will guarantee a brake light effect.

Barring that, there may be a short in the wiring somewhere along the way from the switch to the rear bulb socket. Perhaps fraying from rubbing on metal.


#3

Also, bad grounding can cause this. My '88 Toyota has a ground wire that attaches to the bulb housing at the hold-down bolt. The light housing is plastic, so they needed to use a ground wire. But, the screw came loose, and the bulb lost ground. It back-feed the brake lights through the tail-light circuit looking for ground. Check to see if you have the same problem.