the fan switch feeds current through a resistor to slow the fan motor down on low and med. The high side is a direct path. My guess would be that your resistor block is fried.
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"In the words of Motley Crue, This will always be my home sweet home"
Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84
ralleys and 31/10.5s
Angel girl: 67 Cutlass convertible
330, 3spd stick
Greener: 90 GMC Jimmy
350/auto
Chad Stephens
Orleans,NE
no name yet: 72 442 under serious construction
my site:
http://communities.msn.com/Beastonabudget/homepage