Radio Ticking

So yesterday I changed the oil in my 1985 300TD wagon. I had noticed that the front brake pad warning light was starting to flicker sometimes. When I drove to work this morning, the radio would make a ticking noise that would increase as the car speed increased. I guess that it follows the engine speed, but am not positive. Can someone tell me if the brake pad sensor is causing this? I checked the wires around the oil filter to see if I exposed something when I was changing the filter, but I can't see anything amiss. Any other ideas? Help! Bill Brewer Tehachapi, CA

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