Chief CAD monkey
I decided my 16 year old car needed a little update. Tapped back up light harness to power camera and trigger radio. Blew fuse. Hot wired trigger lead with 20A fuse, works fine. Added relay to isolate tail lamp. Blew fuse. Upped 15A to a 20, still popped. Do I really need to switch to a 5v optically isolated relay to get this back up circuit to run more than two lights?