Pick a wire, any wire - Intermittent electrical fault
Every so often, but not all the time, I get a buzzing noise from the drivers foot well when I press the brake pedal.
With the help of a friend stood behind the car I have confirmed that when I am getting the buzz I am also not getting the rear passenger side brake light. At other times the brake lights are just fine.
The left indicator works fine at all times unless I am pressing the brake pedal and getting the buzz in which case it flashes double time on the dashboard as if the bulb has blown.
Somewhere there is a snapped of chaffed wire. I am guessing that there will be a wire with a break in it still held together by the plastic wire surround so it will be invisible and being an intermittent fault and absolute git to find.
If it was just the brake light I could check the wires to and from that but the indicator adds some mystery to me. Earth wire from lamp to car?
Any suggestions on where I start and what order of checks I make?