Medium and Heavy Trucks
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Click this link for the schematics for this model.
The air pressure switch should be mounted high up near the air brake valve. It is a two wire switch. See PDF page 10. Will be a white and black wire. A281-1 , WHITE and 239-09 , BLACK Let me know if there is still trouble locating it
For test purposes you can use a jumper across the two terminals to see if your brake lights then work.
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