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Does the defrost motor get power from the key switch same as heater motor

It does. You can run a separate lead with an inline fuse over to the GA terminal on ign sw so both are independently fused or my Custom has a single inline fuse off GA connected to the Heater sw. There is a short jumper that connects the power on the BAT terminal of the Heater sw to the BAT terminal on the Defroster sw. Both switches are powered thru a single inline fuse and as I recall it has a 20 amp fuse in the holder.

Thks-

David