A relay is intended for the purpose of keeping high current out of the cab.
If you guys that don’t use a relay get a short in the main power wire and the fuse doesn’t blow then you WILL
have a fire.
Relays are an easy do, so there is no excuse, just do it !
It does take a little extra 18 ga wire and an extra fuse on the switch power wire but it is a good thing to have.
Also always use a fuse on the main power wire going to pin 30 on the relay AND keep the fuse close to the battery.
Size your fuse for the smallest component in the circuit.
This is the diagram I use for basic aux lighting, it works.
4x4, 5sp, Std Cab, Stepside, E4 Red
4” Lift - Coil-Overs, 6” SkyJacker Leafs - No Blocks (Mistake)
31 Spline FX4 Rear Axle, 4.56s and OX Locker, Hurst Shifter w/Optional Stick and "Made by Grev" alignment adapter