SL/R129: r129 light relay
Thread Starter
Newbie
Joined: Mar 2023
Posts: 13
Likes: 0
500sl 1992 5L
r129 light relay
Hey all,
I have a problem with the lighting in the car, at first some of the lamps on the left side of the car did not light up like the road light in the back and the lamp near the headlight also on the left side in front, after some inquiries someone told me to check a relay behind the fuse box. I took it out and it looked fine, I sprayed some contact spray and put it back, from that moment on as long as the car is off the lights are on, but as soon as I turn the switch everything goes off and doesn't turn on, I must have done something wrong with the relay. What could be the problem and if there is a diagram of this relay that I can check if it is working?
Thanks.
I have a problem with the lighting in the car, at first some of the lamps on the left side of the car did not light up like the road light in the back and the lamp near the headlight also on the left side in front, after some inquiries someone told me to check a relay behind the fuse box. I took it out and it looked fine, I sprayed some contact spray and put it back, from that moment on as long as the car is off the lights are on, but as soon as I turn the switch everything goes off and doesn't turn on, I must have done something wrong with the relay. What could be the problem and if there is a diagram of this relay that I can check if it is working?
Thanks.
Senior Member
Joined: Oct 2017
Posts: 369
Likes: 73
SL600
There is no relais for the lamps, but there is the "Lampenkontrollgerät" (sorry for the long German word).It is known for breaking some solder joints and then exactly what you describe happens. It is the long black thing at the outside of the box, dont buy an other one, they are as old as yours and it is not a question of if they break but when.
Good news: It is an easy repair, disasemble them and resolder the broken solder joints and everything will work again.
Good news: It is an easy repair, disasemble them and resolder the broken solder joints and everything will work again.
Last edited by AndreasHannover; Apr 11, 2023 at 06:25 AM.
