This won't cover all the bases but should help with panel planning for many. Compiled during a recent RV-7A panel build. The color column is for the rubber switch cover/boot, also sold by Steinair.
EDIT: 6 Aug 2020: Update to correct the cowl flap switch.
This won't cover all the bases but should help with panel planning for many. Compiled during a recent RV-7A panel build. The color column is for the rubber switch cover, also sold by Steinair.
Im not there yet on my RV, but assuming that if it's like most of the stuff I've worked on over the years, it's so you can reverse polarity on the motor to make it run both directions.
I remember my first semester in A&P school I asked how this worked (electric cowl flaps on the back of a C-337!) and my basic electricity instructor sketched it out on the little spiral bound notebook he carried around in his shirt pocket. Do they even make those anymore?
You need a DPDT switch as your flap motor wires go to the center lug on the switch. What you do is cross the outside lugs, so you just change the polarity on the center lugs to change direction of the motor.