Ac/ Heater fan not working

by Bill
(Great Lakes)

My 86 corvette AC/heater fan will not work. I relaced a blown fuse in the fuse box and the low/med fan settings came on. Switched to Hi the fan would not work and when I returned to low/med speeds they will not work. Ive checked the fuse and it's okay. I'm told there is a direct line from the battery for the high speed fan function on the fan motor that has a fuse or fuse link in it. I can't find it. Any help as to where the fuse is and what color the wire is? I've also replaced the blower motor resistor but still no fan. When putting a test light on the two connection wires (both black)that attach to the fan motor I get nothing.
Can anyone help this novice electrician.

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