Medium and Heavy Trucks
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Hi my name is Dan. I see you have multiple questions open on this issue. I will be glad to help. Check your air manifold switches and wiring and also when replacing these switches be sure not to mix up normally open switches with a normally closed one. Click the link below I posted for you for the air manifold diagram. Let me know
Normally closed means the switch is making contact to complete the circuit and is disengaged to open the circuit.
normally open is the switch is making no contact and then the contacts connect engaging the switch
Hi ***** you get this resolved?