Researching this on my '86 300E:

Mlfuntioning overvoltage relay, low alternator output or a wiring problem seem to be the most likely causes if the light is not flickering but staying on.

Good luck.



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Chuck Taylor
Falls Church VA
'86 300E 5 speed
'95 C220 (wife's car)
'98 Porsche Boxster
Past: '79 280E, '82 300D (18 yrs), '77 240D,
4 250C's