Review on 4 PIN AMP Waterproof Relay Harness by Andrew Britton

I used this relay to power some of the daytime running lights that I added to my Jeep Wrangler. If I connected it directly, the light would draw too much power. The only instructions required are product images, ie. circuits. In my case I connected power and ground to the battery terminals, powered the control signal from Aux 1 (cigarette lighter socket) and powered the headlights so that when the key is on the headlights are on.