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Light bar wiring

5K views 7 replies 6 participants last post by  Goober 
If you tap into the accessory wire and the high beam wire you will blow two fuses.

You also need to know how many amps will be pulling from that circuit

I prefer to switch and power from the accessory circuit.
 
I just put 1 on my 300 and I used a relay wired to the battery with a fuse for the power. Grounded it to the battery also. Tapped into the high beam wire for the power to energize the relay. Even though the relay is always hot, it’s only energized when the key is on and the headlight switch is on high beam. Relay and fuse fit easily in the battery box on my bike.
Yup @ngagne96 this is the best way to do it. Requires minimal amps from high beam circuit to close the relay–then you can power the light bar nearly up to 40A or to whatever the harness fuse is rated.

If you want to calculate your limit, use
Power (Watts) = Inductance (Amps) * Electromotive Force (Volts)
(P=IE)

Divide your light rating in Watts by 12V to get you light draw in Amps
 
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