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Pre soak and spot free problems

Wishywashy

New member
My pre soak and spot free rinse seems to be having problems in one of my self serve bays. All of the high pressure soap and rinse seems to work fine but will not kick on the low pressure for the pre soak or spot free. Still green with owning the car wash so curious as to if anyone could point me in the right direction.
 
Get a decent voltmeter and start tracing power at the rotary switch and work your way down to the solenoids.
 
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