The windows & blinkers aren't on the same circuit! The blinkers are controlled thru the combination relay(biggest) in the rear of fuse box. The power windows should have 2 fuses that power-up lt. rear & rt. front, & rt rear & lt. front windows.
Many times the hazzard switch sticks & wont allow the blinkers to work!

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MERCEDES Benz Master Guild Technician (6 TIMES)
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