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I would lean towards the voltage reducer because it's not connected to the air supply at all. Just 4 wires going to the unit. The truck is currently not running so I can't say for sure if the buzzer works... Although... when the ignition is on I do not hear a buzzer... So I guess I can say for...

Can someone tell me what this device is? It looks awfully new to be a factory item! :roll: Thanks ! Neil ( I should probably say that this is on a 1953 530B Fire Truck, and is located under the dash on the passengerside.)