Stretch1100
New member
I was replacing some dash and switch bulbs the other day and I noticed there's a bulb (A3 I believe) in the rear diff lock switch but it doesn't illuminate at any time. I even replaced the bulb with a known good bulb and still no illumination when I had the parking or headlights turned on. I even engaged the diff lock and got the light on the dash but nothing on the switch. There's only two wires going to the switch so maybe I'm missing one for the illumination or something?