From: 4 Fi Audio IB3 18's walled off 15Hz tune in a VAN BUILD LOG

[cobra93 47]

Hey Kryptonitewhite. I was looking at the pics of the way you wired those toggle switches, if you don't wire the accessory spade to ground the lights/switch may burn out.

I'd wire a jumper from one to the next and so on then to ground so you don't have issues later.