quote:Originally posted by Dave2811:
The round device with the two red wires looks like a pressure switch. It would turn off the compressor when the pressure reaches a certain level.
First unplug the wire on the terminal closest to the compressor motor and see if you have juice in that wire when you push the button. You are testing in the wire, not at the switch terminal.
If no, then the interruption is upstream of that. If you have juice in the wire, plug it back in and remove the other short red wire from the other terminal. The one that leads to the compressor motor. Now test for juice at the male spade terminal on the round switch. If no, then that switch is bad.
I tested as mentioned above and this is what I found in the photo below. The red wire closest to the compressor in the photo is hot all the time, even when the car is off I get light on my test light when I hook that wire to a test light and the other end to ground. Then I hooked that wire back up, unhooked the other red wire (furthest from the compressor) and made a female connection to slip over the male terminal, and hooked a test light to that with the other end to ground, and no test light came on at any point, even when operating the switch to make the car raise. Not sure what all that may mean. Maybe that entire switch and compressor unit needs replaceing, unless there is something else I can test.
Yesterday when I went in the car, it did raise somewhat and pressure guage went up, but then it petered out and I let the rest of the air out with the downward switch. Now it won't go up at all, and no pressure on the guage.
