4 prong to 7 prong

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bsevans5

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I solved my lack of running light on the trailer problem. Turns out fuse # 28 trailer park relay was empty. Those PITA fuse are not just mini fuses but low profile mini fuses. Neither OReillys or Autozone had a 25 amp low profile mini. I bought the 20 amp and everything lit up on the trailer!! Hooray now I have nighttime lights !

Still no 12 V power but I'll get there. The thought of pulling apart the wiring harness with its 24 wires to try and insert a pin to reach the orange wire is a little scary.
May seem scary, but really isn't. Put the pin on a wire and insert it into the harness. Im not a well trained guy. Pretty much everything i learn is from forums and youtube and i did it no problem
 

adamsdaddy

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image.jpeg image.jpeg I finally ran a wire from the 7 pin to the orange wire. So much easier to run a wire on the Expedition than on my Honda Odyssey.
@bsevans5 i was just too chicken to pull apart the wire harness so I used a Posi-tap. Now I have 12 V going to my trailer. Hooray
 
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bsevans5

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I finally ran a wire from the 7 pin to the orange wire. So much easier to run a wire on the Expedition than on my Honda Odyssey.
@bsevans5 i was just too chicken to pull apart the wire harness so I used a Posi-tap. Now I have 12 V going to my trailer. Hooray
Im glad you found a way to make it work
 

iimagine

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View attachment 21017 View attachment 21018 I finally ran a wire from the 7 pin to the orange wire. So much easier to run a wire on the Expedition than on my Honda Odyssey.
@bsevans5 i was just too chicken to pull apart the wire harness so I used a Posi-tap. Now I have 12 V going to my trailer. Hooray
Where under the hood is the orange wire or where did you make the tap?
Thanks!
iimagine
 

Dabbill

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bsevans5, can you tell me how to get that connector apart? It looks complex
I was not able to find the correct pin to put in the connector. So what I ended up doing was cutting the orange wire, and using a barrel connector to extend the wire to the rear of the car.

What are recommendations for tapping in to reverse wire to run to the 7 pin?
 

karisk12

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I used a positap connector on the reverse wire. It is below and to the outside of the orange wire. Its a GY-BN 18 gauge wire in connector 139 position 22 which is the lowest most inboard position.
 

Langer

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Could also tap into the reverse light wiring in the tail light housing.
 

HandyAZ

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If you tap into the orange wire like the photos, what size fuse it it connected to through the harness?
 

adamsdaddy

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In my 2016 owners manual under fuse specification chart I believe it is the #48 40 amp fuse. If it doesn't have a fuse then you'll need to get one and just remember to get the low profile fuses. Remarkably easy to run a line back to the trailer hitch.
 
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