Yes the white plug goes to the switch. So there will be 2 red wires going to the pos and 2 black wires going to the neg. ?
The red wire from your switch should go to whatever power source you want to run the switch.So ground and/or neg bat?
True, you could run diodes to squelch the backfeed and allow them to be powered either by the switch or by the park light circuit, but in this case tapping into the park lights will still lead to the lights being on whenever the park lights are lit.Could be dual powered, but that might also put a back feed into the system.
I wired my red led footwell lights to the power feeding the overhead interior light, and also ran a switch to something that was on with acc power. I don't recall which wire, but I got the info from JKO somewhere, probably. It worked for several months before the dome would randomly flicker and the illumunated switches would sometimes buzz (but not dependant on the flicker). Connections were still tight and soldered.
When Motech fixed some of the issues I had created, this was one of them.
I don't know and never did try to figure out why. The wires were tested for power under the the proper conditions.