I have the MBV1976AAP
Skybox. When I got it, it was not cooling and I could not hear the compressor running at all. Based on the comments here
about bad start relays, I purchased a Supco 3 N'1 RCO410
online. I wasn't sure about the pins on the compressor, but it looked like the top pin was the common as shown on the Supco diagram as the bottom pin, so I assumed the connector was just upside-down. Hooked it up based on that, and it ran and started cooling. It probably ran for an hour or so, then it tripped the GFI it was plugged into.
I'm afraid I may have fried the compressor. Thinking the 3 N'1 replaced all the compressor-related components, I did not re-install the sensor thing that was up against the compressor body- I assume this is the motor protector. Now that I think about it, I'm thinking that component is there to shut off the compressor when it gets to hot, and without it in place, it just ran until it burnt itself up. If that's the case, I guess I'm out of luck.
I guess I'm just looking for someone to confirm this. I'm going to dig around in the service manual and see if there are any clues there, but I'm thinking there won't be since I used a non-original part. The GFI trips instantly whenever I plug the unit in, unless I disconnect the wires from the compressor. In other words, the Supco 3 N'1 is not tripping the GFI by itself, only when it's plugged in to the compressor.
The other possibility would be that I reversed the start and run wires. If that was the case, would it have even run? And if so, would it have fried the compressor, or the 3 N' 1? The more I think about it the more I think I may have actually done that.