I think for 7.3s it is thermostatically controlled, independent from any electrical connection or electrical source. The coil in the front engages the fan clutch when the coil warms up.
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Thomas H.
'97 F-250 CCSB 7.3L Auto, Gauges, Modded H2E, 285/200% sticks, 7.3L IC, Stealth Dual HPOP, Pheonix chip
'03 F-250 CCSB 6.0L Auto, Gryphon CTS, FICM tuning by PHP, Powermax
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