I have a 1994 SL R129 with intermittent wiper issues and the wipers don't park properly, I have been told its the K26 wiper relay but I cant find it can anyone help please
It's up on the scuttle, under one of the plastic covers along with a load of other electronics - I'm afraid I can't recall which side and I no longer have a 129 for reference.
Look for a large relay box with part# 0015427919 printed on it. You can often resurrect them by splitting the cover off the baseplate and then cleaning the contacts up. Glue the cover back on and add a bit of silicone for sealing.
There's more than one module that's responsible for wiper control, but the K26 is the usual culprit in failure to park.