Oh my. That is what I was afraid of. I do not think it is the radio, because it is still the factory unit. They appear to be hooked to the master cylinder, but I am pretty sure they go to the trailer harness, because that is the only "aftermarket" thing on the car and they appear to have been there for a very long time, so I guess they mean no harm. I may get my local MB shop to inspect this however.

Thanks!