Whether you by them from Ebay, Amazon, or locally, get a harness kit with it. Usually includes fuse, switch and connectors to do the install yourself. Make sure have enough nylon Ty-wraps to stow the wires.
You can get Spot or Flood style. Also 3d or 5d lenses have both incorporated. Also make sure you don't exceed the amperage draw for what you're boats electrical system can sustain, Alternator or generator output.
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