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The switches are in series to ground, so if one is bad the alarm will sound. I am thinking your fail safe alarm is bad.My low air pressure light and buzzer would intermittently light and sound although the pressure in both tanks read 120psi. I checked the voltage from cab to switch and reads 12 volt. The ground tests good but I still scraped and wire brushed ground boulders and frame and still no luck. I checked voltage across both switches and they are good when truck pressure is good. I even went and replaced both switches with new ones from Erik's, who by the way is very helpful. Now the light and and buzzer went from intermittently to sounding constantly.....driving me crazy. The voltage across the switches is good to the ground. Any thoughts? Your help is greatly appreciated!!!!
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