Defroster Switch Wiring

[rick3000]

Particlewave, I can't thank you enough for the clarification and your other helpful posts, particularly the one about the different types of switches.

One last question, the symbol above relay pins 9, 10, 13 indicates those pins should be grounded, correct?

I am already working on a DIY for this. Figuring this out also inspired me to look at all of my previous electrical projects, and convinced me I need to redo some of my wiring from 10+ years ago had way too much electrical tape. I also might finally swap out my OBC footwell switch with the base from a Type A convertible top base to enable nighttime illumination.