SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: Battery drain, cluster not shutting off displaying "12 u"

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Old 06-01-2020, 10:01 PM
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2001 slk 320, 1999 sl500
Battery drain, cluster not shutting off displaying "12 u"

I have not been able to track this one down. It completely drains my battery quickly so I have to keep it on a trickle charger constantly. The dash light stays on where the mileage is displayed and just says "12 u" Does anyone have any ideas as to where I should try and track this down? I've done the amperage draw test and with pulling every fuse in the car I have not gotten the amperage to drop.
Old 06-04-2020, 02:26 AM
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'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
I'd invest $130 in a Foxwell NT510 diagnostic tool and check for fault codes in the cluster.

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