My sister has a '98 ML320 with the optional Hella lights on the front brush guard. Well one of the lights was damaged and she bought a replacement Hella (same model #) from an aftermarket store. The problem is the wiring harness from the ML is different (two plugs). Can anyone help. I could cut off the harness and rewire but need to know which is which. Has anyone had to replace these ?

I've only used the MB replacement parts. I would just splice the old harness on. You should be able to figure out which wire is which by using a multimeter.