Replacing AC Condenser Motor?

[HayZee518]

I was on a service call to a guys house for an air handler motor in a heating unit. Now, no one would assume a motor to be bad, right? WRONG! Complaint was that the motor wouldn't run off the plenum limit. I found three wires melted together in the plenum ducting. So I figured I solved the problem when I replaced the wires. Fan still wouldn't run. There was a long three wires running from the splice box down inside the plenum to the motor. The motor was a "b***" to get at. I found a white wire melted to the plenum and shorting out, a blue wire an intermittent short, which would blow the breaker, and a black wire that didn't go anyplace. After replacing a bunch of wires I was able to get the fan to run at half speed off the plenum limit. The guy replaced the fan limit for about 86 bucks but the problem was still there. Come to find out, one motor winding, the one for slow speed had its field grounding out inside the motor housing. So no matter what speed the fan called for it would always go into slow speed. He ended up changing out the motor. Now he has high AND low speeds.