Revised wiring of interior light progressive switch
A slight revision of the wiring shown in
https://webuildplanes.com/adam-dickson-sling2/p/6953/post_6953_full.html
The Eaton 8860K4 / MS25201-4 progressive switch has to be rotated 180 degrees from that shown in that diagram

This diagram and the one below shows the switch from behind
This post is from Adam Dickson
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Strobe light progressive switch wiring
Strobe light progressive switch wiring