I've got a 2003 (R170) SLK 320 and the left brake light has failed.
I've changed the bulb and swapped the bulb & holder with the one from
the right cluster and still the left bulb is out.
I've removed the cluster and can see nothing wrong with it.
So my question is: Do the rear right & left clusters have the same
wiring? My idea was to take both clusters out and sit them in the boot
connected to the wrong side then (as long as the connectors are the
same) if the fault is with the cluster the same light will fail,
however if the fault is with the wiring then the fault would move to
the other cluster.
Or are there any other diagnostic methods that'll help me to pin down
the faults location?
The fault was intermittent but has now completely failed suggesting to
me a loose connection that has finally fallen off - back of the fuse