Trailer wiring
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Freshman User
Joined: Oct 2009
Posts: 47
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From: Southern NH
Trailer wiring
It appears to me that the factory 7 pin trailer plug does not offer a hot 12V pin for aux lighting. My horse trailer uses the center pin for both back up lamps and interior lighting. Does anyone have an easy way to add a constant 12V to the factory center pin of the 7 pin jack?
Senior User
Joined: Feb 2007
Posts: 293
Likes: 1
From: SE PA.
look in your owners manual or a wiring diagram for your year truck but i am sure that there is a 12v hot wire in the plug but it is only hot with the key on. the diagram i have says it is an orange wire but that may be an early superduty. i dont know what pin it is.
Hotshot
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
I would guess someone fiddled with the TRAILER wiring. the center pin IS backup..
open the connector and move the wire over to the right pin..
and if the hot pin is not hot on Key on, then fix the fuse or relay..
Sam
Trailer Wiring Diagrams | etrailer.com
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
Trailer Wiring Diagrams | etrailer.com
This article shows the pins of the 7 way plug. The 12v pin is hot when the key is on. It is generally used to charge a battery on the trailer.
Edit: Too slow.
This article shows the pins of the 7 way plug. The 12v pin is hot when the key is on. It is generally used to charge a battery on the trailer.
Edit: Too slow.
Hotshot
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
Trailer Wiring Diagrams | etrailer.com
This article shows the pins of the 7 way plug. The 12v pin is hot when the key is on. It is generally used to charge a battery on the trailer.
Edit: Too slow.
This article shows the pins of the 7 way plug. The 12v pin is hot when the key is on. It is generally used to charge a battery on the trailer.
Edit: Too slow.
Sam
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07F150trucknut
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