I picked up a PBU, resistor and fan relay this weekend to help isolate the problem I am having with my blower speed. It only works on automatic. I cheated and pulled the resistor from a 300D, though.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge