Im installing a third and fourth turn signal slash brake light for offroading and am currently in the process of wiring them up. They have three wires a ground incase you are mounting them to a plastic surface because they can also ground through the bolt but m problem is in when they are wired to the brake light wire and the turn signal wire they work fine until i turn on my headlights, then they don't work at all its pretty confusing. Im not sure if i have to run some load equalizers or not. Here are some pics so you can see what im talking about. Here are the two main wires:
Here we have major on the right and minor in the middle then ground on the right
And this is to show how i tapped them in.
So waht do you guys think?