Upfitter Switches Wiring
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Tuned
Joined: Nov 2003
Posts: 410
Likes: 22
From: New Mexico
Upfitter Switches Wiring
My 2016 F350 has the upfitter switches, I was able to pull the wires up enough from under the hood and behind the fuse box. Those 4 wire pigtails under the hood are not the same color as the pigtails for the aux switches, so how do you know what wire connects to the correct color wire for the aux switch? I found 13 pigtails under the dash, none of the 13 pigtail's are the color wire of the Aux Switches and a separate 4 bundle of pigtails of the correct colored wires for the 4 aux switches. 3 of the Aux Switches I can use with ease for dash mounted power items, the 4th (Number 3 Aux switch) I want to use for my Raptor Grill lights which is a violet color wire with light green for the Aux 3 switch.
Is there a wiring diagram that beaks down the 13 pigtails to match to the correct 4 pigtails for the aux switches to be used if you need to do a hookup from under the hood?
Is there a wiring diagram that beaks down the 13 pigtails to match to the correct 4 pigtails for the aux switches to be used if you need to do a hookup from under the hood?
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 118
From: Tallassee, ALabama
The four wires behind under the hood are feed thru wires only. There is NO connection on either firewall side of those wires. If you look at the cab ide wiring harness that feeds thru the firewall, you will see the same color for the 4 wires you identifies under the hood. The output wires of the upfitter relay box are taped to this same harness that feed through the firewall, but are not connected to anything. They are blunt cut wires.
Tuned
Joined: Feb 2020
Posts: 476
Likes: 91
From: Owen Sound Ontario
I am not sure if I misunderstood but I know on my truck the wires for the upfitter switches were just hanging down in the footwell around the steering shaft. I tested which one went to which switch with a test light and flipping the switches on and off.
Thread Starter
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Tuned
Joined: Nov 2003
Posts: 410
Likes: 22
From: New Mexico
The four wires behind under the hood are feed thru wires only. There is NO connection on either firewall side of those wires. If you look at the cab ide wiring harness that feeds thru the firewall, you will see the same color for the 4 wires you identifies under the hood. The output wires of the upfitter relay box are taped to this same harness that feed through the firewall, but are not connected to anything. They are blunt cut wires.
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