Really depends on how high the lighting load actually is. Most aftermarket lighting kits always include a relay. This is because the supplier has no way of knowing if your headlight switch can carry enough current.
Hook it up like this: lightweight lead from your positive supply goes to common on your toggle switch. Power comes out one side going to the High Beam Relay coil. Power comes out the other side going to the Low Beam Relay coil. Both relay coils get grounded with lightweight wire from your negative supply.
Heavy wiring goes from positive supply to both relay contact inputs. Heavy wiring out from the contacts to the respective high or low beam. Heavy wire from each light to your negative supply.
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2011 EC250E
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