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I'm by no means a DC wiring expert, but I know many of you are. I bought a light bar off a forum member, and was going to wire it in on my roof. I was going to make my own plug so I can connect/disconnect the light bar at will. But when I search MLS (they originally sold the light bar), they offer the wire harness complete with a switch, a 30 amp fuse, and a 40 amp relay. Why do I need a relay if the power line is already fused? I simply don't understand this stuff. Thanx
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