2nd Gen Barracuda fastback rear window down defogger

g413 said

With respect to wiring, I'm not sure these units are all alike. But in mine, you can look in the discharge opening of the fan and see the "speed reduction" resistor. So all you need to do is run two wires from a switch with 2 outputs to get 2 speeds.

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I`ve got one , I intend to put in one of these days. thinking I`m going to get the intake air from some place else than the speaker opening. already have an unused, switched wire laying back there, from when I rewired the car. the rear compartment separator is alum. sheet on the back side (nhra battery in trunk deal) . ANY SUGGESTIONS ??