my thermal switch is good but when I heat up the switch buzzer will not work. Could someone tell me if these work off a ground system? No volts to the “buss bar” terminal bar. Should the buzzer it self have 12 volts constant power?
From what I can tell the switch supplies a ground to the buzzer and the buzzer has 12 volts on the other side from the key switch in Run. Your motor may be different.
Yes as GA_Boater says the thermo switch grounds the buzzer when engine is to hot
12VDC from keyswitch in RUN position to one terminal at buzzer.
From other terminal at buzzer a wire to the orange wire at terminal strip at engine.
Then there should be a orange wire from terminal strip to the thermoswitch at head..
As mentioned, the thermoswitch only gets power with the ignition switch in "On" position. The red/blu (that connects power to the buzzer) wire is actually connected to the "I" terminal of the ignition switch.
