Upfitter switch
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New User
Joined: Apr 2004
Posts: 7
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From: Klamath Falls
Upfitter switch
I have a 2019 ford f350 Dually Diesel
Sorry for yet another upfitter switch question, however I did not see anything related to my question.
My question is how to run wiring for the upfitter switch to the inside the cab. What would be the easiest, extend the wire back through the fire wall then run to desired location?
Or has anyone just tapped in to the upfitter switch wiring at the switch itself? Seems like it would be easier to run the wire.
Also if I tag in to the wiring at the switch would moving the 5 amp fuse from keyed to all ways hot still work? Do not know why it would not, just thought I would ask people that have more electrical knowledge than I do.
Thanks for any info.
Sorry for yet another upfitter switch question, however I did not see anything related to my question.
My question is how to run wiring for the upfitter switch to the inside the cab. What would be the easiest, extend the wire back through the fire wall then run to desired location?
Or has anyone just tapped in to the upfitter switch wiring at the switch itself? Seems like it would be easier to run the wire.
Also if I tag in to the wiring at the switch would moving the 5 amp fuse from keyed to all ways hot still work? Do not know why it would not, just thought I would ask people that have more electrical knowledge than I do.
Thanks for any info.
Senior User
Joined: Jul 2019
Posts: 127
Likes: 1
From: my recliner
You need to find the pass thru wires under the passenger side kick panel. They come out under the hood on the passenger side. Then run a wire from the upfitter wires on the driver side under the hood to a pass thru wire. Once you do that connect what your new wire to the pass thru in the passenger kick panel. Find a grounding location in the cab for the negative side and you are done. Do a search there is loads of info on this.
Logistics Pro
Joined: Apr 2000
Posts: 4,334
Likes: 306
From: Mills River
Unless your planned load is fairly low current, then I’d recommend against tapping directly into a switch. The upfitter switches are designed to control the high load current relays located in the engine bay.
HTH,
Jim / crewzer
HTH,
Jim / crewzer
BuhBye F450, I'm relaxin'
Joined: Feb 2009
Posts: 1,288
Likes: 19
From: Plainville, MA
You need to find the pass thru wires under the passenger side kick panel. They come out under the hood on the passenger side. Then run a wire from the upfitter wires on the driver side under the hood to a pass thru wire. Once you do that connect what your new wire to the pass thru in the passenger kick panel. Find a grounding location in the cab for the negative side and you are done. Do a search there is loads of info on this.
FTE Community Team
Joined: Mar 2017
Posts: 3,337
Likes: 1,050
From: Florida
Here’s the Ford Bulletin re upfitter switched for 2017+ super duty trucks.
https://madocumentupload.marketingas...1fb63&v5=False
enjoy
https://madocumentupload.marketingas...1fb63&v5=False
enjoy
Junior User
Joined: Jul 2015
Posts: 71
Likes: 0
You need to find the pass thru wires under the passenger side kick panel. They come out under the hood on the passenger side. Then run a wire from the upfitter wires on the driver side under the hood to a pass thru wire. Once you do that connect what your new wire to the pass thru in the passenger kick panel. Find a grounding location in the cab for the negative side and you are done. Do a search there is loads of info on this.
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BuhBye F450, I'm relaxin'
Joined: Feb 2009
Posts: 1,288
Likes: 19
From: Plainville, MA
Here’s the Ford Bulletin re upfitter switched for 2017+ super duty trucks.
https://madocumentupload.marketingas...1fb63&v5=False
enjoy
https://madocumentupload.marketingas...1fb63&v5=False
enjoy
Thank you as well - wouldn't have known about the "blunt cut wires" having been moved to the passenger side! Invaluable info! From what I understand, inside the cab is quite different as well - there's some kind of circuit board with a jumper plug you remove that has all the wires on it that you wire into, then just plug it back in again? (2019)
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Laughing Gas
Joined: Dec 2017
Posts: 1,077
Likes: 8
So passenger side for 2018, drivers side for 2019 and then back to passenger side for 2020?!? Is the assembly line guy in charge of stuffing wires through the firewall drunk?
Laughing Gas
Joined: Jun 2011
Posts: 780
Likes: 5
From: Kentucky
On a 19 the blunt cut pass thru wires on the PASSENGER side, the upfitter switch wires are on the drivers side under the relay box.the pass thru wires can be a little tricky to find,I had to feel around to find mine,as they were zip tied to a wire harness.
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