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Well it looks like Amana bundled the air handler info in with the outside unit or part of it anyway, (I hate old Amana units). I have a pdf of the only drawing I could find. It only shows the blower wiring. Since Amana is now part of Goodman, the air handlers now start with "A", but not in your case. Not sure if you want to give out your e-mail, but if so I could send it to you as an attachment. Fan relays are not expensive, and if the thermo was in the "ON" position for a long time, the contacts may have heated up over time and burned open, tapping sometimes makes it work, but not for long. If the relay has been there since 1990, replace it. Pat M.
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