Thorsen and Jim, this makes a lot of sense and I can picture it now. I'll take the seat out this weekend, do the measurements as you say, and let you know what I find. (Too bad if solder connection in gasket is bad, I guess you have to remove the window.) Hopefully I find that ground wire is the problem as Mike suggested. Ron

__________________
1971 220D, daily driver, new paint, 142K
1973 220D, low compression
1975 300D, back on the road! 166K
1971 220D, salvage, rear hit, engine excellent
1972 250, bad cam, but runs!
1971 230, engine stuck
1971 220D, low compression, rusty
1976 240D, salvage, engine excellent
1966 230SL, water in oil after rebuild