Replaced the OVP relay and all is well. Have now driven approx 500 miles with no bad signs from the replacement wire, MAS unit or OVP relay.

In conclusion, the OVP relay did it's job by shutting down the MAS unit when the white + red stripe wire with melted insulation finally came apart under the fuse box. I was fortunate that this burnt wire did not damage any other wires in the harness.

As mentioned previously, the melted wire appeared to be very old damage. Probably caused by a temporary short many years ago - perhaps when the alarm system was fitted.

I now have a spare MAS unit (the original was fine) - although the plastic cover is cracked.

__________________
Neil.


1991 190E 2.6 170k
1995 E320CA 57k
1999 Chevy Tahoe 98k
2000 R1150GS 45k
1983 300CD 178k - sold, but not forgotten