Since the lights are a big load (drain) and have to run through a switch... a relay is more suited to carry that load instead of the switch. The switch does not handle large power loads for very long and it does not take that much current to trigger the relay coil. I used to work for a relay company that supplied automotive companies. They use relays for everything (turn signals, windshield wipers, cooling fans, lights, etc.) They never direct wired a circuit that was a large load. I personally have not installed anything on my Teryx that has used relays yet... but I have also installed a separate battery (Optima yellow top) for large loads (stereo & winch). After reading the original post I will use them for any future additions. Does this help or thoroughly confuse?In the past on vehicles , I've always wired directly from a power source ( battery , fuse box , ect. ) . Without a relay . Is a relay an amp LIMITER suitable for the accesory being installed ? Or what purpose does a relay serve ?
Why do I want to use a relay and do I really need to?Sorry I'm still not understanding the relays purpose. Is it acting as a mini voltage/amp regulator with specified connections per say ?