Headlight problems... combination switch or something else?
Posted: Sun Mar 23, 2014 1:21 pm
We have a 1990 L300, we've been having headlight problems (described below). From searching previous posts, I think it could be an issue with the combination switch, but I wanted to see if anyone had any other suggestions or thoughts before I start pulling things apart as Falco described.
The problem has changed/developed over the last month or so. Initially the right headlight just started getting a bit dim. Then both headlights started getting "stuck" on so that the only way to turn them off was to pull a fuse (6th from the left on the top row in the fuse panel under the dash on the driver's side). Initially this only happened after going to high beam, but now it happens whenever the lights are switched on. The left headlight which was dim to start with has now gone out entirely, the high beam light on the dash is always on, and high-beams have stopped working entirely. The running/parking lights also no-longer work.
The other thing that might be worth mentioning is that when I pull the fuse to switch off the headlights, I can hear a relay trip, and it sounds like its in the daytime running light unit. The one remaining working headlight actually still works with the fuse removed, so we've just started leaving it out...
Does this sound like a combination switch problem, or is something else likely to be going on? I also wondered whether it could be an issue with the daytime running light unit (a TruckLite DRL).
Any advice or suggestions would be greatly appreciated!
Thanks!
Rowan.
The problem has changed/developed over the last month or so. Initially the right headlight just started getting a bit dim. Then both headlights started getting "stuck" on so that the only way to turn them off was to pull a fuse (6th from the left on the top row in the fuse panel under the dash on the driver's side). Initially this only happened after going to high beam, but now it happens whenever the lights are switched on. The left headlight which was dim to start with has now gone out entirely, the high beam light on the dash is always on, and high-beams have stopped working entirely. The running/parking lights also no-longer work.
The other thing that might be worth mentioning is that when I pull the fuse to switch off the headlights, I can hear a relay trip, and it sounds like its in the daytime running light unit. The one remaining working headlight actually still works with the fuse removed, so we've just started leaving it out...
Does this sound like a combination switch problem, or is something else likely to be going on? I also wondered whether it could be an issue with the daytime running light unit (a TruckLite DRL).
Any advice or suggestions would be greatly appreciated!
Thanks!
Rowan.