Trying to figure out where the brake light switch (if it has one) is located. I see a box on the crossover that looks similar to AMU on Freightliner. Is one of those the box for brake lights? If so which one?
I found several air switches but none have power to them. I checked all of the fuses and relays and all appear to be fine. The ones that I think might be for brakes were marked E1 and D1 (if I remember right) But none had power to them. There was one that had brake on it and we replaced that one with another air switch from a different Volvo but nothing.