E-Class Coupe (C207) & Cabrio (A207) 2010-: E250CDI Coupe, E350 Coupe, E350CDI Coupe, E500 Coupe, E550 Coupe [Coupes & Cabriolets]

Recurring noise and dead battery issue.

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Old 01-27-2021, 06:35 PM
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2010 e550 coupe
Recurring noise and dead battery issue.

My car has been dying or killing significant battery in key position one. I’ve also noticed it makes a constant humming or buzzing noise from the rear left when in position one. I am thinking this may be the seatbelt motor but I am not sure. Anyone have any idea or experience with this? No the headlights or blower motor is not left on. My battery is a new Bosch H8 with 850 CCA. This only happens in key position 1 so it must be some component drain and not the alternator.
Old 01-28-2021, 09:02 AM
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'71 Pinto
Pull trunk panel, could be amplifier.
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Last edited by konigstiger; 01-28-2021 at 09:07 AM.

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