Hello.Just picked up a 1972 LT9000.Low air buzzer is on constantly with 110 psi air.Anyone know where the buzzer switch is located? I can't find it.Thanks.

 

Pete they are usually mounted under the dash near or on the foot valve manifold. Sometimes the are on the firewall side near the air brake hoses.They are usually plumbed in the supply line to the foot valve.

I Hope This Helps--------- Hotwrench

 

It also could be behind the dash panel depending on how the truck was set up.