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I think you should do a whole lot more reading before you mess with relays and pressure switches.Is there a way to bypass the pressure switch for diagnostics?, there are 3 contacts. My air tanks are full. In the relay/fuse panel, there is a relay marked ctis overdrive, does it do anything? I can't feel the relay engage when the switch is turned on before the engine start. The other breaker does light up the ctis lights.
correct, see my post #5That is the pressure transducer. It tells the system what the tire pressure is when the system does its pressure check. The tank pressure switch would be on the 3rd tank probably.
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