I agree with the above cautions. However, assuming this vehicle is exclusively used off road, consider the following...
Connect the relay control pins as follows:
-One pin to Highbeam switched ground signal wire behind headlight.
-other pin to positive signal wire behind headlight. Use fuse on this wire.
The above will only close the relay when the high beams are turned on. Since you may not be familiar with circuits, I recommend using an ohm meter at this point to verify the circuit between N.O. and Common are open when Highbeam switch is off. Similarly, these two pins should "short" (close) when the highbeams switch is switched on with headlights on.
Now, since you state the new lights are grounded via the bumper - that leaves a positive wire only that needs to be dealt with since the lights are already mounted. Connect the following to complete your setup:
- connect the single wire from each light to the "common" pin on the relay (only these two wires from lights).
- connect the Normally Open (N.O.) pin on the relay to a wire connected to the positive battery post, use fuse on this wire.
Note, the Normally Closed (N.C.) pin would be the opposite of what you want. So no wire to this relay pin for this setup.
If you need more help, please post a photo if YOUR relay pins and I'll assist further.
Using the relay will help prevent your headlight circuit from being over loaded since the current driving the new lights will pass through the relay pins/contact, not through the Highbeam circuit. It also gets around the switched positive wire requirement of the new lights.
Regardless, I recommend installing two fuses on this setup. One between battery positive oost, close to battery. Second one between positive signal wire behind headlight and relay, closer to factory headlight wire harness end. Use fuses recommended or supplied in new light kit. The relay should also be one from the kit if not, many will work - just be sure it is rated for the current draw of new lights. The switching side of relay (side that creates magnetic field to pull relay) should no add too much to the Highbeam circuit.
