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If you add wiring and use relays you can do about anything you want.
if you use the stock wiring and switches on the bike you are limited to the capacity of that wiring.
the aux circuit should be good for a total of about 200 watts of current draw- but I wouldn't go over 120 watts or so myself.
I have the H-D foglights and wired them in with a relay. A suitable relay will enable you to wire both sets of lights through it. That way the power to the lights goes through a new wire you add, direct from the battery, while the only load you add to the original wiring is the power to switch the relay. If you buy a relay from an auto shop for adding lights it should come with a wiring diagram that is pretty self-explanatory.
The only limiting factor would be the current rating of the switch but it should be able to handle the coil load of both relays.
What kind of switch are you using? A MoCo auxiliary rocker switch mounted in a housing or a stand-alone push-button switch like comes with the fog light kit?
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