Notices
1999 - 2016 Super Duty 1999 to 2016 Ford F250, F350, F450 and F550 Super Duty with diesel V8 and gas V8 and V10 engines
Sponsored by:
Sponsored by: Real Truck

No running lights on trailer

Thread Tools
 
Search this Thread
 
Old Yesterday | 01:33 PM
  #1  
dkoutfitters's Avatar
dkoutfitters
Thread Starter
|
3rd Gear
Joined: May 2026
Posts: 3
Likes: 0
No running lights on trailer

I have a 2011 Ford F450 that has the fifth wheel package as well. Running lights on my trailer we’re working before. The only thing functioning now is the hazard turn signal and brake lights. I’ve replaced the relay as well as the fuse with no luck. I’ve also replaced the seven pin and four-way adapter on the bumper assembly. Any other thoughts of what the issue might bewould be greatly appreciated.

The trailer lights work, on my son’s Dodge, as they should.
 
Reply
Old Yesterday | 01:46 PM
  #2  
marksman76's Avatar
marksman76
Laughing Gas
5 Year Member
Photogenic
Liked
Loved
Joined: Oct 2018
Posts: 1,003
Likes: 85
From: San Diego
Ground wire connections on trailer or to your 7 pin could be places to start.
 
Reply
Old Yesterday | 02:42 PM
  #3  
apache84's Avatar
apache84
Laughing Gas
10 Year Member
Liked
Loved
Community Favorite
Joined: Feb 2014
Posts: 811
Likes: 292
From: KY
Were the fuses you checked burnt? Next thought would be the tail light wire came out of the tab in the female/truck end trailer socket. Typically a tiny little screw holding the electrical part into the body. Pull the screw, and with a enough slack in the wiring you should be able to push it out of the body and check/clean/tighten where the wires are landed.
 
Reply
Old Yesterday | 03:45 PM
  #4  
dkoutfitters's Avatar
dkoutfitters
Thread Starter
|
3rd Gear
Joined: May 2026
Posts: 3
Likes: 0
Originally Posted by apache84
Were the fuses you checked burnt? Next thought would be the tail light wire came out of the tab in the female/truck end trailer socket. Typically a tiny little screw holding the electrical part into the body. Pull the screw, and with a enough slack in the wiring you should be able to push it out of the body and check/clean/tighten where the wires are landed.
Fuses were not burnt. I'll check the connector. I should mention, same result if trailer connection is on the 5th wheel and on the bumper.
 
Reply
Old Yesterday | 03:46 PM
  #5  
dkoutfitters's Avatar
dkoutfitters
Thread Starter
|
3rd Gear
Joined: May 2026
Posts: 3
Likes: 0
Originally Posted by marksman76
Ground wire connections on trailer or to your 7 pin could be places to start.
I'll take look at the ground near the 7pin. Hoping it is the one on the drivers side rear frame rail.
 
Reply
Old Yesterday | 04:58 PM
  #6  
marksman76's Avatar
marksman76
Laughing Gas
5 Year Member
Photogenic
Liked
Loved
Joined: Oct 2018
Posts: 1,003
Likes: 85
From: San Diego
Run a test ground wire from truck frame to trailer frame to see if anything changes.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Smokeat
2017 - 2022 Super Duty
32
Nov 17, 2024 05:23 PM
Melanie Ross Thaxton
2009 - 2014 F150
19
Sep 25, 2023 12:29 PM
Dennis72355
All Things Towing
5
Dec 14, 2021 08:23 AM
HKusp
1999 - 2003 7.3L Power Stroke Diesel
13
Apr 7, 2014 09:56 PM
iez44
All Things Towing
7
Sep 6, 2013 02:43 PM




All times are GMT -5. The time now is 04:59 AM.

story-0
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-1
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-2
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-3
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-4
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE
story-5
2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Slideshow: first look at the 810 hp 2026 Shelby F-150 Off-Road!

By Brett Foote | 2026-05-12 12:50:07


VIEW MORE
story-6
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Slideshow: Everything You Need to Know about the 2027 Super Duty Carhartt Package!

By Michael S. Palmer | 2026-05-07 17:51:06


VIEW MORE
story-7
10 Most Surprising 2026 Ford Truck Features!

Slideshow: 10 most surprising Ford truck options/features in 2026.

By Joe Kucinski | 2026-05-05 11:17:22


VIEW MORE
story-8
Top 10 Ford Trucks Coming to Mecum Indy 2026

Slideshow: Here are the top 10 Fords coming to Mecum Indy 2026.

By Brett Foote | 2026-05-04 13:49:49


VIEW MORE
story-9
5 Best / 5 Worst Ford Truck Wheels of All Time

Slideshow: The 5 best and 5 worst Ford truck wheels of all time

By Joe Kucinski | 2026-04-29 16:49:01


VIEW MORE