On my 1983 380SL, with the engine warmed up,I've noticed that the temperature gauge reads quite bit higher with the engine running than with the key on/engine off (second position). Is this normal? I've studied the wiring diagrams and it seems it might be an alternator problem. The fuel gauge reads the same in both situations, btw. Any ideas? Thanks ia.

Paul

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1983 380SL
1995 C280
1995 S500 coupe
1990 Mazda Miata
2004 Suzuki Hayabusa