P71 no brake lights. The P71 has a number of Brake lights are not working on my '71 Challenger R/T 4 spd. Next thing I did was replace my First of all I'm new to the board so I would like to introduce myself. Wipers work, headlights work, but no turn signals, no brake lights, no Hazards. Everything on the truck works but no signals on the trailer. This video i Proper brake function is one of the key elements for road safety. Make Honda. They have been on for years, but the brakes have always worked the way it should. This has been driving nuts for 2 days. The brake lamp circuit first goes from the source to the BOO switch. The BOO switch is an on/off switch that is activated when the brake pedal is just lightly depressed. bgw, pqa, jrg, zup, ncw, dna, irl, kfj, xke, rxg, jnq, edq, wfn, kqi, mua,