All 3 roof airs failed simultaneously?

[plyonsMC9]

Just curious.  When you turn on the bad units and you get a hum, did you try spinning the fan by hand to see if it would kick in?  I have had humming motors that would start running with a spin which added to the diagnostic information available.

Hi Lin,
No, I was afraid to try that - It's really difficult to get my hand up there from inside the coach.  and if I ran up the ladder w/the motor malfunctioning, I was afraid I'd burn out what was left of the motors.  Maybe if I used a stick from inside to give the blower a bit of a nudge.  I'll post back what happens.

Thank you, Phil

[plyonsMC9]

Ha!  Where are the best bunch of busnuts anywhere?? 

RIGHT HERE - That's where!!       

I think oiling the shaft.  and using a stick (yeah, I'm a chicken & don't know what I'm doing) to move the squirrel cage while turning on the blower made the final difference.  Turned on the motor, gave a push on the cage w/ a stick, cage stuck for a bit, then spun freely.  So, I miscalculated yesterday how freely they spun when I was spinning 'em from the roof.  They are running right now for a good 10 minutes.  I'll go up in daylight on the roof & oil both sides of the shaft & make sure all good. 

Same story on rear a/c.

Middle A/C still worked fine today after running for 10 or so minutes yesterday.   

What a fanstastic group - I really appreciate every suggestion.  I have read them ALL carefully and have learned a tremendous amount about not just my a/c units, maintaining & running them through the winter, but also circuit & electrical system troubleshooting.  I was totally resigned to the fact that I would be buying 2 roof a/c units + labor.  So some kind of $1,500 bill was looking at me in the face.  But NO! 

Thanks Team!
Kind Regards, Phil

[jjrbus]

 I know how you feel Phil!!!! These guys have save me numerous times.

[Melbo]

Coool Phil

You have saved us with this board MANY times and now the board saved you

You work magic in cyber space and it comes back and helps you

What a great bunch of people here

Melbo