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I just watched a YouTube video of a guy replacing the fan motor and control module on a C5. I am assuming that the control module is what you are calling the regulator. You did well to change those suckers way up above the passenger footwell. At 6"6" I can't get into places like that. I hope my fan always works. It was too hard to video and work under there so he didn't really show the plug connections. I would be curious to know if you have 12 volts coming from the dash controls to the control module. You don't have to do anything about amps as you mentioned. 12 volts to ground is all. There has to be 12 volts getting there from somewhere. This guy thinks there is no fuse for the fan motor. I would have to check my fuse panel diagrams to believe that.