Rear driver side indicator stopped working on Alfa 147
I have a 51 reg Alfa 147.I noticed a couple of days ago that my rear driver side indicator no longer works. Took the cluster off, bulb is fine. Cleaned the contacts, still didn't work. Went to Halfords and bought a new bulb, still doesn't work. So probably a wiring fault?
Got a meter on the wires to the light, measured ~ 3.7Vdc when indicator off and about 11.6Vdc when the indicator is on. So not sure why its not working?
I suppose I also need to check if the brake light is still working.
How do I go about diagnosing the wiring fault? Where can I get a circuit diagram from?