Waterdriver
Goblin Guru
Thanks for the info on that. I have seen the diodes for that issue. So far in testing I don't have that issue, but i do only have the tail lights and instrument panel connected to the lighting circuits.I have the same lights on my car project (non goblin). Not sure how the GM wiring is but these scooter/motorcycle lights required a diode on the parking lights and the brake lights wire for my car circuit. The circuit inside these lights (cheap China) allows bleed over to the other circuit if one is on. So for example if I turned on my parking lights/head lights the third brake light would energize because of bleed over into the brake circuit. If I had the lights off but stepped on the brakes there would be bleed over into the parking light circuit. Hopefully you don't run into this but the fix is easy with the diodes.
I'll find out more when I source a third brake light/back up light combo and connect it up. I found this today that I might consider using.