I'm sure this has been hashed out many times. Have done numerous searches. I have a 13 250 I added the upfitters too shortly after I bought it new. I'm finally getting off my butt to wire up the pump for my slip tank in the bed. Tired of popping the hood every time I need to pump fuel. I found the 4 wires under the hood by the master cylinder. They do not match up with the color codes my owners manual says. Also I cannot get any of them to show power to the wires. Was at the dealer today and he said those were for the pto and stuff and the only upfitter wires are under the dash. I thought they had wires inside the cab and under the hood.

Can anyone point me in the right direction. Pump is 20amp max so I'll be going to the #1 Upfitter. My wife will be getting this truck when the new one comes in and if I have any chance of her helping fuel things I'll need this to work

Brett

 

Just making sure I'm understanding... you turn an up-fitter switch on and the wires under the hood don't show power, correct?

The wires under the hood don't connect to the up-fitter switches, they're cut off somewhere north of the parking brake pedal/ up behind the fuse panel. Red-black-blue-white right?

That's logical for the wires under the hood to not have power if you didn't connect them under the dash inside to the cut aux wires.

 

Correct. I installed all the supplied stuff for the upfitters. I flip the switch, the light turns on but there's no power under the hood at the 4 wires I have found.

So I can only connect to the wires inside the cab by the parking brake? Then just shove the wire thru the firewall?

Brett

 

The wires are up by the parking brake. They have to be wired to the upfitter switch. The wires then pass through into the engine compartment for you to hook to what you want powered.

 

There are two different sets of wires. One set runs from the harness under the hood to roughly above the parking brake pedal, blunt cut on both ends, and IIRC unlabeled.

The other set is the up-fitter switch wires, these are blunt cut behind the fuse panel, and labeled Aux #1- Aux #4. Brown, Violet-green, Green-brown, and Yellow.

You have to tie these two together under the dash, then you'll get power out under the hood from whichever switch wire you hooked to an access wire.

Page 26 for the upfitter/aux wires. Page 27 for the customer access wires. This .pdf says colors are Blue-grey, Green-white, Blue, and Violet-orange.

 

Video of wiring


https://m.youtube.com/watch?v=t_KrytQxVBY