Where is the glow plug relay on the 1978 300D. Not on the fender or behind headlight. Thought it was one of the two silver boxes underdash but when I uplugged each one the glow plug system still functioned. Anybody have a pic?
I never here the relay click off when the light goes out. Doesn't happen a minute later either. I haven't solved my charging problem and I wonder if the relay has failed and is drawing current and preventing proper charging.

thanks

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Kevin

1978 300D
1979 240D