Welcome to the forum!
Mine came with a harness (that I only used temporarily, but it does work). I removed it and wired things up like this:
Items required:
- some electrical wire in black and some in red. It doesn't need to be heavy cable. You will need ONE piece (perhaps 200mm long) of heavy red cable and you'd be best served by buying a 20A in-line fuse which will have enough wire on both sides to fulfill your needs. It's all explained below. I've put links to the kind of things you need.
- a 12V
switch
- a 20A or 30A automotive in-line
fuse
- a 30A or 40A automotive
relay
- some
spade connectors, some
ring connectors and a
crimping tool to attach these to the wires
Method:
Take a light black wire and connect the ring connector to the end. Attach the ring to a dash mounting bolt inside the cabin near the steering wheel (it may already have a wire connected to it, it's a great source of earth or negative in the cabin). Run this wire to where you want the switch, cut the cable and attach a spade connector to it. Attach this connector to the switch in the middle.
You now want to run another light black wire from the switch through the firewall and out to near the battery. Connect a spade connector to the wire, attach the spade connector to the switch. If you got a double pole switch, make sure you use the same side as the other connector.
On the other end of the cable that you just ran out in the engine bay, attach a spade connector to the cable and put that on terminal number 86 of the relay. That's the hard part done.
Now take a wire (red is okay, blue if you can manage it, it won't be a heavy load on it so size is unimportant). Attach a spade connector to one end, put this on terminal 85 of the relay, and attach the other end to the blue wire that goes to your right-hand headlight (this is the high beam wire). You can strip away a small amount of the wire and solder the new piece in, then use some rescue tape to seal it up. What you have just achieved is restricting the light bar from being used when high beam is on ONLY.
Grab the light bar. It should have a heavy black and a heavy red cable coming from it. Attach the black cable to the battery negative. There's TWO wires to go.
Attach a spade connector to the heavy red wire and connect this to pin 87 of the relay.
Last one: attach one side of the fuse's cable (doesn't matter which) to the battery positive. Attach a spade connector to the other end of the fused wire and join this to terminal 30 of the relay.
Job is done. How you mount the light bar is another thing. I put mine on the top of my bullbar, by welding a couple of small pieces of steel flat-bar to some 75mm exhaust clamps, painting these black and bolting the light bar to these.
Hope that helps.