I have an '87 300 TD wagon that has a short or break in the circuit to the passenger (right) side low beam headlight. The high beam works fine, and I have checked the fuse box and the fuses are okay for all the headlights low and high beams.

I am going to try tracking down any break in the circuit for this low beam light, but in looking at the wiring diagram there is a "light control unit" between the lights and the fusebox. Is this just a relay - or something else? And where is it located?

I think the diagram I have has enough info I could track if the break is between the lighting control unit and the fusebox or lighting control unit and headlight. I just have to find everything.

Any other advice on tracking this down appreciated as well.

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Jimmy M.

87 300TD 230k mi's