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Electrical issues/Broken ground cable

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Old Nov 1, 2022 | 06:14 AM
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08 Mercedes E350
Electrical issues/Broken ground cable

Hello, lately ive been having strange electrical issues on my 09 C230:
Flickering cabin lights when first opening the door ( not when manually turning them on )
Strange static/crackling sound coming from front driver side speaker only ( others are fine )
Driver side turn signal will work for about 3-5 seconds initially, then the signal will blink rapidly and stop working ( in order to get the turn signal to work again for that 3-5 seconds i have to turn the car off and on )
Driver side emergency flasher does not work
Driver side parking light does not work
Passenger side parking light would not turn off until battery dead ( had to remove bulb )
Parasitic drain ( battery dead if not driven for 2 days )
Check engine light

Yesterday i saw this grounding cable was broken:




Could this broken cable be causing those electrical issues?

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Old Nov 1, 2022 | 06:41 AM
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Old Nov 1, 2022 | 07:54 AM
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As an aside, pictures show what seems to be a lot of corrosion...live in area with winter salted roads or chance car was flood damaged ?
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Old Nov 1, 2022 | 10:25 AM
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08 Mercedes E350
Originally Posted by gamma300C
As an aside, pictures show what seems to be a lot of corrosion...live in area with winter salted roads or chance car was flood damaged ?
Indeed, I use this car only for winter driving and i live in Quebec. Lots of salty roads here
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Old Nov 1, 2022 | 12:00 PM
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Have you followed the rust problem with rear subframe posts?....lots of photo's. Your fellow Quebec neighbors are well represented 😊.

Sure you've already taken a look under there and hosed out the mud/sand that collects in the open frame cranny.

Even here in Western NC with some minor winter road salt, (my 13 year old C300) I blew out good size rust flakes and moist debris.

Have you confirmed your problems solved with ground wire fix ?
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Old Nov 1, 2022 | 12:09 PM
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Is ground cable that broke connected to engine and frame...?...had a problem in old BMW where motor mount failure allow motor to rock the ground cable good enough to point of near complete break. The oxidation on your cable may be enough alone or with cable "wiggle". Just a thought.
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Old Nov 2, 2022 | 01:04 AM
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08 Mercedes E350
One side is still connected to the frame, the side going to the engine has broken off completely at the terminal . I will repair it over the weekend and report back
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