What you need to do is have the controler wired upto a second relay that will take the amps of the fan. Basicly a relay switching a relay I used a 30 amp for the low speed and a 70 for the high speed. That way the controler is protected.

(aka suprathepeg, aka Sean)
89 v6 SWB truck "BLACK BEAUTY" EB valves, P&P head 30 over.
95 FZJ80. Lifted. locked and rollin on 33s (my dream machine)