The routing is not on the above trailer wiring diagram because it is optional and different for every trailer. If you have an illuminated switch and want the lights to turn on with just.

Driving Fog Light Wiring Diagram Unlimited Wiring Diagrams
Auxiliary light wiring diagram. Alternative fog or driving light schematic. If you are like most pickup owners youd rather tackle installing a gooseneck hitch instead of a pair of auxiliary lights. If you want a. The safest way of doing this is with the use of a standard 12v relay. This works to make the lights turn on when the brights are on. Start date mar 26 2012.
Activate auxiliary lamp switch. Splice into the headlight wire and run to the coil side of the relay. Installing driving and fog lights is easy right up to the point you have to think about the wiring. Whatever the name it provides a tap for access to the tow vehicle positive power. How to wire your light using a relay the relay will have 4 points on it marked 30 87 85 and 86. That is kind of cryptic isnt it.
Wiring diagram to hook up auxiliary lights. Auxiliary light wiring diagram wiring diagram is a simplified up to standard pictorial representation of an electrical circuitit shows the components of the circuit as simplified shapes and the capability and signal connections with the devices. Diagram 1 general auxiliary light wiring. Use wire ties to secure any slack portion of the 12 volt connection or wire harness in the engine compartment away from moving parts or excessive heat. If lamps do not illuminate check fuses and all wiring connections. Then the brain freezes and beads of cold sweat start forming on your forehead.
Now a trigger wire light gauge is all that is needed 14ga 16ga as it will carry only a low amount of milliamps. The left side is the pin out of the point is sticking out from at the bottom and the the right side is showing a schematic representation of the relay circuitry. The diagram above shows how a relay works you connect a suitably high current positive wire from the. Follow the diagram on the relay goes to the two switch lugs. Typically auxiliary power is for charging rv batteries interior lights power for accessories etc. In order to power an auxiliary light you will want to connect the light to a power source and in most cases a switch.