heater blower wiring for 390

[pw520a 19]

hello guys, I have installed my lower dash with my original wiring and I have identified an hooked everything up. I purchased a new under the hood harness along with a new big block gauge harness. I purchased the car in parts so i am not sure where the fan motor hooks up to the harness. I have seen pics of a red wire coming from the fire wall above the heater motor, where does that wire go maybe it is for a 351 only I dont know. any help would be appreciated. thanks Gary on whidbey island

[murphsmustangs 10]

It plugs on the blower motor resistor located on the heater housing. Use the terminal that is not used by the motor speed control plug that also plugs into the resistor.