Can't seem to find an answer to this in Bentley or anywhere else...

Trying to determine which wire is which for the early R53 roof clock. I can guess, but I thought someone may know for sure...

Edit - wires are:

Red/Green = 12v
Grey/Red = DCU
Black/brown = gnd

 

I don't have a wiring diagram but if I had to guess one would be 12V+, one would be ground and the third would be a signal from the instrument cluster to adjust the backlight brightness. With a multimeter, it should be easy to figure out which is which.

 

Thanks. No exposed wire there and can't get the multimeter into the connector. Brown is the gnd. I assume gn/rd is the 12v - bmw seem to associate gn with 12v sometimes...

 

Un-bend a paper clip and stick it into the connector to take a reading.

 

You are a smarter man than I Good call...

 

Updated the original post with the correct wire designations for those interested in future.