Medium and Heavy Trucks
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Hi my name is***** this is a 1982 it will be difficult to get any wiring diagrams for but to troubleshoot this using a test light, test for power on both sides of the fuses/breakers with the key switch on. Any fuses/breakers with power only on one side are bad. In this circuit there is an air pressure switch usually mounted on or near the foot brake valve.. Test for continuity of the switch, check the wiring for damage, and test for power through the circuit and to the switch and buzzer. Let me know
There were 3 common areas Mack mounted the low air switch. Drivers side under the dash and center dash near the maxi switches, and some cases outside on the firewall. Something this old might be easier to wire in a universal buzzer and switch with an inline fusible link if it hasnt already been done..
Hi, Did you get this resolved?