[REDRIDER]

I friend bought me a light bar kit. Has a 13" a 42" and two 4" fog light style ones. I plan to hook them to one power source switch, then put an inline switch to the 4" as they will be on the sides for spotlights, The rear will also be on an inline switch. MY question is, is there a good place to grab a key on power source that is not powering something else? I don't want to overload an existing ckt by adding to it.  If not I guess I can run a relay powered from the battery off the headlamp switch or something.

[impact]

I'm guessing you will be drawing at least 10 amps so definitely go the dedicated relay route with the proper gauge wire to match. I recently did a similar project. A relay enabled from the ignition circuit and drawing battery power for the lamps.
Front single row 30" bar draws 6 amps and twin rear flood lamps draw 1 amp each. Front and back are on their own switch.

 

[gfmoto]

I wired my 32" light bar and 2 4" spots directly to the battery.
Wired the rock lights into the fuse block. All on their own switches.   I have run ALL my lights + my BOSS ATV28 450W (plugged into the lighter port) and it never skipped a beat. 

[REDRIDER]

Is there any accessory power source from the fuse block on these that isn't being used so we can hook into it without disrupting other ckts?

[impact]

Is there any accessory power source from the fuse block on these that isn't being used so we can hook into it without disrupting other ckts?

Even if you were to find an unused power source you would be hard pressed to find one with the proper wire gauge required for the current draw of your particular setup hence it is probably best to come off the battery into a relay with a minimum 12 gauge wire.

This setup would work for you.

https://www.amazon.com/MICTUNING-Wiring-Harness-Rocker-Switch/dp/B06WVWH5W4/ref=sr_1_5?ie=UTF8&qid=1497633350&sr=8-5&keywords=mictuning%2Brelay&th=1