nope I didn't tie them into the original backup circuit, I just used the harness that came with the lights, the only things I dis was A-extend the harness between the two light pods, used butt connectors, then I put heat shrink tubing over the butt connectors to keep out the moisture, no that's how my stupid smartphone took the pics and yes they're protected from rocks and debris coming from the rear tires, if anybody is interested in getting something like these for their expedition checkout
WWW.BLACKOAKLED.COM that's where these lights came from, I'm happy with my new lights.