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If I was wanting them I would get them that were LED's.
The switch allows the Hi-Five® lights to be operated independent of the headlights. You can flash them just like a big rig.
I would pickup power from the headlight switch. Then go to the ON/OFF switch.
What this would do is allow the lights to come on with the headlights and it you want to flash them, use the ON/OFF switch to Make & Break the circuit to them.
On another note. I'm not a fan of the Scotchlock connectors.