Medium and Heavy Trucks
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Hi my name is***** will be glad to try to help. If they work by bypassing or jumping the terminals but not with a new switch you might have the wrong switch. Some are normally open and some normally closed but look identical but different part numbers.... Make sure they parts store did not get that mixed up. Let me know
Yes. That information was not posted. I was going by you jumped the circuit with a jumper wire and they worked. Maybe I misunderstood. So with a jumper connected do they work? and then go out with the jumper disconnected?
There has to be a problem with that switch. With the wires disconnected, test with an OHM meter continuity across the switch with both the brake pressed and released. sounds like the new switch may never show continuity and is defective. Let me know
Also check and verify that port is getting air pressure with the brakes applied.