I have a 1996 C220 with 150,000 miles and I bought it new. I like car but it has cut off several times, and was hard to start, and ABS light stays on. I was advised that it was likely the wiring since mechanic saw white dust and covering coming to pieces. Is it possible to replace connectors only, or do you have to do the entire harness/wiring? What is test of wiring harness, or do you just use visual inspection? (or codes). If harness is needed, where is cheapest place to get new harness? thansk.