Funny problem that popped up with my sprinter the other day.
When I put my foot on the brake pedal, the brake lights come on (as usual) but so do the dash lights and my parkers (just as if I had turned my headlight switch one click).
If I am on the brakes and turn on my parkers the brake lights get a bit brighter too.
I plan to get out the multimeter and trace some wiring soon, just wondering if anyone had seen this problem before and could give me advice.