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Francis, that is a good thought. If you are right, it may be ...dare I say simple...by moving the power supply to the correct side of the low air buzzer.

Ok, so what changes with the engine running? On a stock truck - nothing. In your case, kinda hard to tell. Why would one go through the trouble of installing a brake pedal switch? Does your truck retain the hydraulic pneumatic booster (air pack)? It appears as if the feed supplying the lights is...