All of the turn signals and flashers operate through the hazard flasher switch. Have had problems with mine operating correctly off and on since buying the car. Just ordered a new hazard switch through Fast Lane for $17.00 instead of the dealership which wants $33.00. I expect this to fix my problem.

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Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000