Take a minute and find what happened to your 120 across Run & Common . pins 1 & 3 of your harness , where/what do they connect to ?. The potential relay/start cap only helps start ( boost) the compresser & is only in the circuit for about 7 seconds max or you will need a new start cap. It's not even needed with a capillary tube or piston type metering device but is needed with most TXV 's. If compresser simply quit while running it is going to be an open circuit or the compresser has had a mechanical failure. Normally a bad run cap just won't let it start again once it shuts off. Could be as simple as a bad thermostat not calling for cool .
