I'm installing a set of driving lights on my '04 MC and assumed that since the high / low bulbs were different that they would have separate plugs (as every other car I've had / worked on is) but there's just the one plug going into the headlight. I don't have a multi meter, so I can't check it myself - does anyone know which wire is for the high and which is for low or ground? I tried searching but I found some that said a white wire and some that said green/yellow. If anyone knows which one is the high on an '04 MC, please let me know.

 

Forgot to mention - these are the standard headlights, not xenon

 

Pull the headlight plug & take your test light & see which one is hot with the high beams on. If you don't have a test light, go out & buy one. They are very cheap & very useful.

 

It's green/yellow at the ECU connector in an MCS - probably the same at the headlight, but that's not definitive.

 

Yes, green/yellow for the left high beam and blue/yellow for the right high beam, according to wiring diagrams for non-Xenon.

 

Awesome, thanks!