The Ford Transit can be ordered with the optional Upfitter Auxiliary Switches (Option Code 67C). Each switch is ignition supplied (they only works when the key is in “run” position) and can provide a 12V / 20A max output to an auxiliary load (such as an Air Lift Spring Kit Compressor, Exterior LED Bar, etc.).
Please note that the information below is valid for the 2015-2019 Transit. For 2020+ the harness has been moved to the glove box. We’ll update this page soon with the latest instructions!
So, you ordered the Upfitter Auxiliary Switches option and are ready to connect a load to it? NOT THAT FAST! You still have to order an additional accessory from the Ford dealer: The Wiring Pigtail Kit (Part Number WPT-1408). Without it, you don’t have access to the output of the switches:
Now, let’s get the driver seat out of the way because this is where that we access the switches output. There are four screws to remove; two in the back of the seat:
and two screws in the front of the seat:
Don’t take the seat off yet! We still have to detach the electrical harness:
We’re now going to take the batteries cover off. We have the dual batteries option; your setup might be different!
Remove those two screws to free the metal plate:
Here is the C33-H connector! We will connect our WPT-1408 pigtail to it.
While we’re here, if you ever blow one of the Upfitter Auxiliary Switch 20A fuse, this is where to replace it (see Fuse Panel in the picture above).
The WPT-1408 Wiring Pigtail kit comes with four crimp splices and shrink tubes, but we decided to install female quick-release terminal instead. This way, we can easily add or change the loads in the future:
We can now connect the WPT-1408 Wiring Pigtail Kit into the C33-H connector:
Turn the ignition on and flip those switches up!
(you can use a multimeter to find out what switch power what wire…)
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(We’re using the upfitter auxiliary switch #1 to power our Air Lift Spring Kit):