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why wont my sidelights work

Yugguy

MB Enthusiast
Joined
Apr 6, 2016
Messages
2,256
Location
Rugby UK
Car
W204 C220CDI Elegance with Comand
Ok, so I went to change the sides to led. Undid the inner drivers side cover and pulled out the bulb holder with pliers. Bulb is on at this point. I take it out and try an led. No light. Try the led the other way round, no light. I try the other leds. No light.

So I go to put the original bulb back in but it has blown. I try several other normal wegde bulbs but no light.

I check the bulb holder metal strips and bend them tight. I even connect the metal loop wires on the bulb to the wires going into the holder but no light.
 
Check the fuse for the sidelights you might have blown it.

You did switch them off before changing right?
 
I found out the problem. I'm old school so just did what I always do and changed the bulb with the lights on so I could see when the new ones worked.

Turns out the car will cut power to the circuit until the lights are turned off and the bulb replaced. It wont restore til it sees a working bulb. :doh:
 

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