You may be interested to know that your Ford Super Duty may be equipped with an enhanced upfitter switch board to help power your upfit component needs.
Six circuits
For your convenience, built in upfitter switches have been moved to the overhead console for easy access. Plus, Ford increased the number of switches from four to six. So now, you have more capability to control components, such as winches, electric spreaders, lights and more.
4 x 25 amps, 2 x 40 amps
To help power your upfit needs, Ford has increased the circuit capacity over the previous generation. There are now four 25 amp circuits. Plus two 40 amp circuits which can be configured to be hot at all times. So you don’t need to have the vehicle running for power.
Enabling key-off battery use for 40 amp relays
In order to convert the 40 amp relays to key off battery use, there are a few steps you’ll need to take.
- First, you’ll need to locate the relay box under the engine hood, next to the driver side fender.
- Then remove the relay cover by pressing the tab and lifting it off.
- Next, locate the five amp fuse. You’ll then need to pull it out, slide the spacer over, and place it so the left prong is in the far left slot and the right prong is in the middle slot.
- Replace the cover and your 40 amp circuits are now set to run on battery power even with the key out of the truck.
- Keep in mind, to help remind you when power is flowing through the switch, it will remain illuminated to let you know it’s on.
Can I use the upfitter switches to run rock lights under the fenderwells? 2021 tremor
Yes. The 25 amp fuse would be more than enough to run plenty of LEDs to light up the underside. That would only work while the truck was running if you use the 25 amp though.