7 pin problem
Thread Starter
|
New User
Joined: Apr 2010
Posts: 2
Likes: 0
7 pin problem
2005 f150 SuperCab 5.4L with factory 7 pin installed. Only getting power to one side blinker and brake light. Checked with test light at the 7 pin plug and at the end of the wiring assembly. Unplugged the 7 pin wiring assembly and checked the power coming from the wiring harness and everything is fine. Replaced the 7 pin wiring assembly and still only getting power to the one side. Anyone have any thoughts on this? I'm sure it's probably something simple but I can't find any answers.
Junior User
Joined: Nov 2012
Posts: 58
Likes: 0
From: Northville, NY
+1 on that! No matter how well the manufacturer's think they build and seal up the 7 pin connectors, moisture gets inside them. If you live in the northern US or Canada where they use road salt in the winter, the problem is even greater.
It is possible that there is corrosion or dirt on the pin under the cap. A good cleaning may help, but if it is corrosion, you'd be delaying the inevitable.
Open up the connector and check for dirt, corrosion, loose connections, broken wires, etc. Sometimes they are repairable, sometimes not. If it is too corroded to be cleaned and reassembled, replace it. They're available at auto parts stores everywhere.
FWIW, I always plan on replacing the 7 pin on a tow vehicle every fifth year or so anyway, but that's here in NY where road salt is heavily used
Senior User
Joined: Feb 2011
Posts: 421
Likes: 2
From: FT. Rucker AL
2005 f150 SuperCab 5.4L with factory 7 pin installed. Only getting power to one side blinker and brake light. Checked with test light at the 7 pin plug and at the end of the wiring assembly. Unplugged the 7 pin wiring assembly and checked the power coming from the wiring harness and everything is fine. Replaced the 7 pin wiring assembly and still only getting power to the one side. Anyone have any thoughts on this? I'm sure it's probably something simple but I can't find any answers.
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
2005 f150 SuperCab 5.4L with factory 7 pin installed. Only getting power to one side blinker and brake light. Checked with test light at the 7 pin plug and at the end of the wiring assembly. Unplugged the 7 pin wiring assembly and checked the power coming from the wiring harness and everything is fine. Replaced the 7 pin wiring assembly and still only getting power to the one side. Anyone have any thoughts on this? I'm sure it's probably something simple but I can't find any answers.
If still not working, 90% chance it's a poor ground. Take your contacts off that side and clean them. Are your running a working on that side? If not, you might have two grounding points,s one for each side although not common.
Time to then start with a probe tester and start working from the front back until you find the dead spot.
Senior User
Joined: Feb 2011
Posts: 421
Likes: 2
From: FT. Rucker AL
If I read this correct, you have power at the 7pin receptacle. If so, try cleaning the connection as noted above. Plug and unplug several times to "clean" both surfaces. Some might disagree but I shoot a squirt of we'd-40 int the recep.
If still not working, 90% chance it's a poor ground. Take your contacts off that side and clean them. Are your running a working on that side? If not, you might have two grounding points,s one for each side although not common.
Time to then start with a probe tester and start working from the front back until you find the dead spot.
If still not working, 90% chance it's a poor ground. Take your contacts off that side and clean them. Are your running a working on that side? If not, you might have two grounding points,s one for each side although not common.
Time to then start with a probe tester and start working from the front back until you find the dead spot.
Sorry dont mean to
Trending Topics
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
I have found that I had a blown fuse in the truck itself, however my trailer connector is having issue's no matter what tow vehicle I use. I am gonna try clean it and checking the wires as mine looks like at one point someone put a new connector and it and looks kinda sloppy.
Sorry dont mean to
Sorry dont mean to
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Senior User
Joined: Feb 2011
Posts: 421
Likes: 2
From: FT. Rucker AL
Well I did replace the fuse and pulled the trailer about 15 miles with no issues. However I think its bound to happen again when I get a change I am going to take a look at it close and see whats going on the connector it self on the truck doesnt look like its in bad shape or corrodid
Thread
Thread Starter
Forum
Replies
Last Post
1fixitman
1999 - 2003 7.3L Power Stroke Diesel
6
Jan 11, 2013 12:20 PM
bossgobbler
1999 - 2003 7.3L Power Stroke Diesel
11
Oct 27, 2011 08:18 PM