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F150 Aux Switch Wiring

Trying to figure out how to set up aux switches in your F150 can be a bit of a pain. In this article, you’ll learn where to locate the auxiliary switch wiring, identifying relays and necessary fuses. The F150 has the option for the necessary wiring and switches to be set up right from the factory. The auxiliary switchboard on the overhead console makes aftermarket customization easier with six prewired switches connected to the power distribution box. Each circuit is individually fused for connection of electrical accessories.

Remember:

For maximum vehicle performance, keep the following information in mind when adding accessories or equipment to your vehicle:

When adding accessories, equipment, passengers and luggage to your vehicle, do not exceed the total weight capacity of the vehicle or of the front or rear axle (GVWR or GAWR as indicated on the safety compliance certification label). Ask an authorized dealer for specific weight information.
It is your responsibility to ensure that any equipment you have fitted complies with applicable local legislation.
An authorized dealer needs to install mobile communication systems. Improper installation may harm the operation of your vehicle, particularly if the manufacturer did not design the mobile communication system specifically for automotive use.
If you or an authorized dealer add any electrical or electronic accessories or components not produced by us to your vehicle, you may adversely affect battery performance and durability. In addition, you may also adversely affect the performance of the other electrical systems in the vehicle.

Locating the auxiliary switch wiring:

f150 aux wiring - locating under the hood

There are three sets of blunt-cut and sealed circuits. Two sets are under the hood and behind the battery tray, and one set is inside your vehicle at the passenger footwell.

The powered set (A) is taped behind the battery tray and has a red spot tape mark.

The second set (B) is also under the hood. It is taped behind the battery tray and has a white spot tape mark. This set routes to the interior passenger footwell. Remove the battery and battery tray to access the underhood circuits.

The interior set is taped on a wire harness by the passenger side footwell. This set is the other end of the circuits taped behind the battery tray, with a white spot tape mark. Remove the fuse panel access door in the kick panel to access the wires. If you do not see them, you may need to pull them down.

Identifying the auxiliary switch wiring

The switches are coded as follows:

Identifying the fuses under the hood

Get Creative!

There are so many options for aftermarket accessories after the wiring is figured out! Lights and winches are just some of the things that you can install to make your F150 more unique to your needs. Just remember to stay within your vehicles weight limits and have fun!