From what I could gather in the assembly manual, which isn't very clear, is that it gets its power from the horn relay. It is saying that it completely bypasses the fuse box and goes to a circuit breaker then feeds the power to the windows. I just really wasn't sure on that.
Correct, no actual fuse but a circuit breaker mounted on the firewall, likely in the master cylinder area. Little breaker, two threaded studs on it, one wire will head inside the car and one from the horn relay as mentioned I believe. Test for power on both sides of the breaker, key doesn't need to be on because your power windows are live on your 66 as you know, the key can be off.
As far as where it mounts, here is a link to a 65 assmbly manual if you don't have a 66. You can look at the power feed for the conv top, front power seats or power windows, thy all hook up to this circuit breaker:
I would check with Donny from American Auto Wire for the breaker and any wiring needs you have.
1966 Impala SS
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You are right about it being inside, I don't even know why I said firewall...
I put a set of power windows into my 66 Canadian full size Pontiac (same setup as Impala) and even mounted the circuit breaker up under the left corner of the dash! I did this about a year ago and had already forgotten where it was. DUH......
I've been working on a 66 impala with factory power windows. I am having trouble with where the power feed comes from any help would be great. Thanks
No fuse, no connection to the fuse block in any way. There is a circuit breaker mounted high on the LH bulkhead area behind the driver's kick panel. A feed comes into the car just ahead of that area from the firewall and attaches to the high tension stud on the breaker. The firewall connection is a molded connector/grommet assembly. There is a feed wire from the horn relay that runs up the LH inner fender skirt and plugs onto the male blade inside the molded connector/grommet.
The Driver's P/W harness has a wire with a ring terminal that comes over from it and attaches to the low tension stud on the breaker.