With circuit breaker box power on (24V) but outside disconnect removed on Trane TWR split system heat pump, the relay contactors pull in. But, when I reinstall the outside disconnect (120/240V), the single-pole relay contactor points release and stay out. The condensor fan tries to start for that millisecond before contacts pop back out. Once contactors pops out, fan stops.
Points stay out until I remove the disconnect. Then they pop back in due to 24V. When I turn power off at inside breaker box, then the points release due to no power.
I find no obvious visible problems. I recently replaced the start capacitor. Using ACV 500 meter setting, the fan motor draws about 50 volts (out of 230 rated) for that milisecond it stays on before going back to zero V. Anybody actually seen this exact problem before.
I had the relay out and cleaned it of bugs etc and reinstalled it following my own drawn wiring diagram. Is this a short somewhere. where to check first or next???