I have a newly-rebuilt engine, including a new engine block heater, on my W123 300D. As it is no getting cold at night, I plugged the block heater in, it worked splendidly ONE night, the engine started smartly the next morning, and the block heater hasn't worked since.
Is there anything to look for or consider other than just a prematurely failed block heater unit. Everything was new on this, heater unit and wiring.
Thanks!