Review on 5 Pack Of Heavy-Duty Waterproof Relays With Harness - SPST Automotive Relay With 12 AWG Tinned Copper Wires, 40/30AMP 12V DC From Irhapsody by Joseph Winfrey

I used this relay to power some daytime running lights I had added to my Jeep Wrangler. If I had wired it directly, the lights would consume too much power. The only instructions needed are the product pictures, i.e. wiring diagrams. In my case I ran power supply and ground to the battery terminals, control signal from Aux 1 (cigarette lighter plug), and power out to the lights, so the lights are on when the key is on.