I should have mentioned...I am not exhibiting the signs of a bad head gasket (no pressure when cold, no coolant loss, coolant stays the same color..)

It must be electrical, you are right. But where do I start. I did get some very good advice from a previous post, but all were beyond my skills as this requires taking the dash off. I want to take to an indy and explain to them what to do first so the clock does not tick, tock forever...

AC

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'83 240D (W123) 321K miles
250KM Mileage Award
500KM Mileage Award

'84 300TD (W123) 215k miles
250K mileage award pending