I've got a motor off of a Sears air compressor. I found one cap is bad, and the other missing. The ohm reading on circuit with bad cap is 0.8 and 1.4 ohms for circuit with missing cap. So how do i figure what value of cap to get for the missing capacitor? I am trying to fix this for a guy from work. He was as usual not listening to my advice and was buying capacitors to replace the missing one. They all burned up. I'm sure he had no idea what size to get. But what i wonder is if the start cap is bad would that cause the other to burn out? I'm thinking the circuit with the lower ohm value is the starting windings. Am i right or backwards.
Try the link, I've had success with then in the past. Good luck!
Check ohms to the frame of the motor before you buy anything to make sure the windings aren't grounded. The start winding is the one with the higher resistance to common. The motor should have a plate or tag on it telling you what size capacitor to use. You might try calling sears repair center for the correct run capacitor to install. Most psc motors won't use 2 capacitors, as they use a centrifugal switch inside the motor to disable the start winding once rpms are up. BTW, psc means Permanent Split Capacitor.
