Upfitter wires

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Apr 6, 2025 | 09:27 PM

mhodgson

Thread Starter

5th Wheeling

Joined: Mar 2007

Posts: 39

Likes: 1

From: Wake Forest

Upfitter wires

Drivers side under the hood up near the firewall are four wires stubbed out, red, black, white, blue…12-24 gauge. Same wires are under the dash taped to the bottom of the steering column. Inside however, there are two smaller wires with heat shrink tubing on the ends in the same bundle, anyone have any ideas on what those are? 2005 Ex V10 EB 4x4.

Thanks

Mike

Apr 7, 2025 | 04:50 AM

01__Excursion

Cargo Master

Joined: Nov 2017

Posts: 3,103

Likes: 535

From: Rock Hill, SC

Sounds like the customer access wires, allowing you to add accessories with wires already passed through the firewall.

Apr 7, 2025 | 07:26 AM

mhodgson

Thread Starter

5th Wheeling

Joined: Mar 2007

Posts: 39

Likes: 1

From: Wake Forest

Yeah, the four wires I mentioned are definitely that (I call them upfitter wires) and indeed all four wires appear on both sides of the firewall. These other two wires are taped into the same bundle but do not appear on the engine bay side.

Mike

Apr 7, 2025 | 07:53 AM

mhodgson

Thread Starter

5th Wheeling

Joined: Mar 2007

Posts: 39

Likes: 1

From: Wake Forest

Guess it would have helped if I watched the video!! I will go and look at the wiring diagram. I have two extra but it would be great if they were both tied to the fuse block!

Thanks again,

Mike

Apr 7, 2025 | 04:19 PM

01__Excursion

Cargo Master

Joined: Nov 2017

Posts: 3,103

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From: Rock Hill, SC

Possibly tow control? But I think there are more than 2 needed.

Apr 7, 2025 | 10:21 PM

INFRNL

Cargo Master

Joined: Apr 2012

Posts: 2,028

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From: Bottom Of Pikes Peak

They should be customer access wires. you should find the other end near the PCM on the inside, they are taped to the wiring harness near there. They are worthless IMO...nobody wants to tap onto wires twice when they should have a solid run besides fusing.