I have an old condenser that I can't find fan motors that will last. Condenser model # RDD-95xA (pretty sure). Bohn/Blanchard born in 1975. Original motor numbers are obsolete. Tried Marathon X507, Fasco T2537 no luck. All specs. for the new motors same as old except the old motors are lots heavier and lasted 30 years. Don't think there's a power supply problem. Is there a motor out there that can last or do I have to up the hp. Bearings OK. Motors <seize> when power supplied.