So I'm getting our trailer ready for some trips. The a/c has problems. I turned it on and all I got was a humming. I turned it off, went on the roof and took off the a/c top and all looked normal. So I turned the a/c on again and and got the humming again so I gave the fan shaft a little turn and it started and it seemed to run normal. Left it run for a while and the 20 amp breaker tripped. I should add the blower fan acted the same way when just the fan was running. Could this be a capacitor problem? There are two capacitors, a smaller black one (red and white wire) and a larger shiney one (3 posts: 1 orange 2 red and 3 white wires).