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Old 03-09-2022, 07:21 PM   #1
CaptainPalapa
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Seeking advice, alternate trailer wiring plug

We have the typical side-of-the-truck-bed fifth wheel plug on our F-350. (I didn't install it, but I definitely use it!)

I need to have an *additional* outlet down at the bumper. (Have to pull a "regular" trailer next week.) That trailer is also a 7-blade, so I bought a split 7-blade/4-flat outlet (because you always need the 4-flat). Can I just "tap" into the wiring on the other plug for it? (Heat shrink, all that, yeah.)

Not sure what other way I'd do it, but I'm betting someone out there has done this before. Any advice welcome.

Note: This is not for trailer-behind-another-trailer. This is to have an alternate socket at the bumper.
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Old 03-10-2022, 10:07 AM   #2
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I always like to take the path of least resistance. Rather than going through the pain staking exercise of wiring, splicing, and maybe making a mistake along the way, also interfering with your truck wiring, why not just get something like this? If it were mine, this is what I'd do:

Click here

or

Click here, slightly higher cost though.
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Old 03-10-2022, 10:15 AM   #3
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OP here: Yeah, you're right. I have those parts, but running through the tailgate (we have a hard cover), wouldn't work as well. Turns out, the part i need is BU5Z-14489-AA. There's a hole in the bumper where it goes and a harness attachment right there, tucked away that I didn't see previously. Local Ford doesn't have it, but say they can have it tomorrow. I just have to drive 30 minutes one way to pay for it first. Ugh. But thanks for the help!
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Old 03-10-2022, 07:02 PM   #4
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Is the wiring harness a simply, plug it in and it works? So there's no cutting wires, splicing, and all that? If so, that's the better way to. It's attached permanently then.
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Old 03-10-2022, 07:12 PM   #5
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Exactly. Fitting the proper harness is the right way. I'm loathe to cut and splice when I don't have to! Not afraid to, but... so messy!
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Old 03-11-2022, 07:19 AM   #6
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I also would order the correct part from Ford. No splices, not on anything late-model.
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Old 03-11-2022, 10:22 AM   #7
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Etrailer probably has the same.
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Old 03-14-2022, 03:42 PM   #8
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7-blade option

My 2500 came with a bumper mount 7-blade.


When I had the gooseneck installed, they added a 7-blade to the inside of the bed. It simply provided a "T"/"Y" to allow the new end to go into the bed.


Look for the connector under the bed or tail lights
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