Re: 4 offroad lights
They usally have for prongs
1. For wire from power source
2. For wire to what is being powered
3. For wire comming from switch
4. For wire going to ground.
They are typically labeled on the packaging. Essentially a relay is just a remote switch. This allows you to take a small amount of power inside of the truck to be able to switch on something requiring more power on the outside allowing you to safely tap a bigger power source.
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