I put power to the old motor and it started up, so there's definitely no power getting to the new motor. I do have the vacuum actuated system--and it is a massive overcomplication of a what should be a simple system. I'm thinking my ccu is bad because in the last days of the old blower motor's life, I sometimes had to hit the buttons on the CCU several times to get the fan to start. I'll dig more and report back.