Dashboard clock dead or erratic
The analog clock in the R107 instrument cluster has stopped, runs intermittently, or jumps. Most commonly caused by a failed electrolytic capacitor on the small PCB inside the clock module — a well-documented DIY repair.
Applies to 1986–1989 560 SL US-spec instrument clusters with the analog VDO clock at the bottom of the binnacle. Tachometer and speedometer typically still function normally.
What the diagnosis checks
- Does the clock face show any movement at all (second hand twitching, hands at random position)?
- Does it run for a while then stop, or jump erratically?
- Does the cluster have power otherwise (tach, speedo, warning lights work with key on)?
Possible causes it points to
- Failing clock capacitor (intermittent)
- Clock mechanism stuck
- Dead clock capacitor (no movement)
- No power to the cluster
Background reading
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