Trailer lights
Thread Starter
|
Senior User
Joined: Apr 2005
Posts: 111
Likes: 1
From: Ft. Myers FL
Trailer lights
I recently bought a 2016 F250. I have about 4,000 miles on it now. I'm having trouble with trailer lights.
I don't have any trailer turn signals. I cleaned out the connector, got a new adapter, checked fuses (although I don't see any that say trailer turn signals). Any suggestions?
I thought it was a trailer issue, but my boat trailer is almost new. So I tried utility trailer and no turn signals either.
Thanks!
I don't have any trailer turn signals. I cleaned out the connector, got a new adapter, checked fuses (although I don't see any that say trailer turn signals). Any suggestions?
I thought it was a trailer issue, but my boat trailer is almost new. So I tried utility trailer and no turn signals either.
Thanks!
Posting Guru
Joined: Sep 2013
Posts: 1,348
Likes: 6
From: Edmonton, AB
I would check your ground wires, if you have a ground that is bad or might have been missed. If one of your grounds is messed up or missing that could be a problem, it would be the same.if you have a ground that is not making a good connection.
if in doubt take some sand paper where the ground is on the frame, sand it down and re screw it down. It could be a poor contact to the frame.
I would also call up your ford dealer talk to the parts guys and ask ( if your manual doesn't state it ) if there is a particular fuse or relay that would be assigned to your trailer plug connection and ask him what numbers and where on the fuse box under the hood or in the dash panel that might have blown or be missing that may be causing your issue
if in doubt take some sand paper where the ground is on the frame, sand it down and re screw it down. It could be a poor contact to the frame.
I would also call up your ford dealer talk to the parts guys and ask ( if your manual doesn't state it ) if there is a particular fuse or relay that would be assigned to your trailer plug connection and ask him what numbers and where on the fuse box under the hood or in the dash panel that might have blown or be missing that may be causing your issue
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
If both trailers are acting the same way, it's not your trailers. Have you looked under the hood fuse box and identified the turn/brake light fuse?
Cleaning your 7 pins connectors is a good idea but I bet you have a bad connection on one of your brake/turn connections and blew that fuse.
Pretty common to do if your boat lighting wasn't unplugged while submerged.
Cleaning your 7 pins connectors is a good idea but I bet you have a bad connection on one of your brake/turn connections and blew that fuse.
Pretty common to do if your boat lighting wasn't unplugged while submerged.
Cargo Master
Joined: Jul 2009
Posts: 2,710
Likes: 77
From: Central Florida
I would check for voltage at the connector's both the 4 pin and 7 pin. If there is none as mentioned above let the dealer worry about it.
Trending Topics
New User
Joined: Jul 2016
Posts: 3
Likes: 0
I remember having the same problem with my trailer stop/turn lights, I would double check the fuses and manual again, I am pretty sure it is either a fuse or a relay problem.
Also, there is a tester that you can use to test the 7 pin and the 4 flat light wiring on the truck end. When I am having trailer light problems I pull this out of my tool box first (well after ensuring the harness from the trailer is fully plugged in).
Just like senix and xr7 said, it's under warranty, take it to the dealer if it doesn't look like a fuse
Also, there is a tester that you can use to test the 7 pin and the 4 flat light wiring on the truck end. When I am having trailer light problems I pull this out of my tool box first (well after ensuring the harness from the trailer is fully plugged in).
Just like senix and xr7 said, it's under warranty, take it to the dealer if it doesn't look like a fuse
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Postmaster
Joined: Sep 2010
Posts: 3,472
Likes: 2
From: Southern Cal
The other thing to note is that both blinkers/brakes don't work. Each blinker is on a separate circuit and pretty much eliminates a boat wiring issue. Maybe one side but not both sides.
Go back under the hood.
Go back under the hood.
Lead Driver
Joined: Oct 2014
Posts: 5,934
Likes: 1,351
From: NY/Canada border
I keep a couple of trailer connector testers around. A 4 pin and a 7 pin. If those showed the plug not working, you can bet I'd be at a dealer with this issue on a 2016.
Senior User
Joined: Jun 2015
Posts: 230
Likes: 1
From: elkmont alabama
had the same issue on my dodge 2500 and I was blowing a fuse under the hood in the fuse block and I had a bad ground some where so I added another ground wire to the wire that kept blowing the fuse.
but it was a dodge and it had other ground issues
but it was a dodge and it had other ground issues
Thread
Thread Starter
Forum
Replies
Last Post
Choke
1997 - 2006 Expedition & Navigator
6
Jul 14, 2004 04:14 PM