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Air brake switches on 2001 Mack RB


troy.maillet.9

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  • 2 weeks later...

Yeah on an RB the brake lights should work off of an air switch, two wires, are you looking for current on your air switches? There will be two with 2 wires I can think of, one is normally open the other normally closed, the normally open switch is the brake light switch, +12v on one wire all times, +12on both or closed when the brake is applied over 5-10psi.

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