SL-Class (R231) 2013 on: Discussion on the SL550

SL/R231: Alternator fuse location? Is there one

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Old 05-08-2024, 03:10 AM
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Alternator fuse location? Is there one

Hello
My sl550 stalled and when I went to check the battery in the trunk the negative was loose. And when I loosened it and reseated it there was a bit of an arc and now my alternator isn’t charging.

is there a fuse just for the alternator? If so does anyone know the location?

Thank you
Old 05-08-2024, 03:25 AM
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Seems really strange -- how have you determined the alternator is not charging?
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Old 05-08-2024, 03:26 AM
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I jump starter the car
the car ran worse as the volts on the battery slowly fell to 9.0 and the car turned off again.
Old 05-08-2024, 03:31 AM
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I jump starter the car
the car ran worse as the volts on the battery slowly fell to 9.0 and the car turned off again.
Old 05-08-2024, 03:52 AM
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How old is your battery? Do you have a way to check its ability to hold a charge?
Old 05-08-2024, 09:02 AM
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Originally Posted by jakubmomentum
I jump starter the car
the car ran worse as the volts on the battery slowly fell to 9.0 and the car turned off again.
Well, that sounds like a bad alternator. Have you scanned for codes? The B95 Battery Sensor (BSN) may have been damaged. Though I'm not sure, but it sounds like it could keep the battery from charging. Best to scan for codes. (NOTE: While the below info is old, it probably is still useful.)



Last edited by JettaRed; 05-08-2024 at 09:05 AM.
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Old 05-08-2024, 09:11 AM
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This may help: https://mbworld.org/forums/e-class-w...code-list.html

Post #7 lists the fault codes for B95.

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