SL/R129 Parasictic battery drain in 500SL

04-29-2023, 02:57 PM

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Brian McL

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'90 500SL '07 C280 '98 E320, '19 C43

Parasictic battery drain in 500SL

I have a parasitic battery drain on a 1990 500SL that I believe is the clock circuit in the instrument cluster.

This is also a problem in the W140's

Does anyone know which diode / transistor drives the clock and needs to be replaced ?

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SL/R129: Parasictic battery drain in 500SL

SL/R129: Parasictic battery drain in 500SL