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Originally posted by Boismier
a relay connected through the accessory circuit (i.e a lot more work ...)
Actually the relay is used to handle the load. The wires normally running to the handle bar switches are thin and are not rated for the kind of amperage driving lights draw. Typically 12volts from the battery (CB whatever) goes to a fuse and then to the source pin of the relay. The load pin of the relay is connected to the lights. 12 volts is also ran to the handlebar switch and back from the switch to the positive end of the relay coil. the other (ground) contact of the relay is connected to chassis ground. turn on the switch and the relay energizes passing 12 volts (source to load contacts - heavyier gage wire) to the passing lamps.
 
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