Trailer lights not working

Reply Subscribe

Thread Tools

Search this Thread

Apr 26, 2011 | 04:08 PM

lakewood

Thread Starter

Posting Guru

Joined: Oct 2009

Posts: 1,340

Likes: 4

From: Bradenton, FL

Trailer lights not working

I've noticed that with all my trailers that when im running my lights(driving at night) the trailer lights dont illuminate, The brake, and turn signal light all work. So since its happening between several trailers im guessing i have a bad fuse. What fuse would this be? This is on my 05 250 btw. When towing these same trailers with my 350 the lights work fine.

Apr 26, 2011 | 04:15 PM

BCM

More Turbo

Joined: Feb 2011

Posts: 719

Likes: 17

The pin could be bent or disconnected on the receiver. Check the wiring going to the connector on that vehicle. I believe it is the green wire.

Apr 26, 2011 | 04:48 PM

bpounds

Hotshot

Joined: Aug 2006

Posts: 17,398

Likes: 317

From: Whittier, CA

Check fuse 38, a 20 Amp, under the dash.

Apr 26, 2011 | 07:23 PM

lakewood

Thread Starter

Posting Guru

Joined: Oct 2009

Posts: 1,340

Likes: 4

From: Bradenton, FL

the connector looks good from what i could see, its dark out. the fuse also checked out

Apr 26, 2011 | 07:38 PM

BCM

More Turbo

Joined: Feb 2011

Posts: 719

Likes: 17

Got a voltmeter? Bust it out and test the ground and the green... which is technically 5:00 if the post is at 12:00, which is also where the ground is.

Apr 26, 2011 | 08:40 PM

lakewood

Thread Starter

Posting Guru

Joined: Oct 2009

Posts: 1,340

Likes: 4

From: Bradenton, FL

Dont have a voltmeter, i just dont understand what else would make it stop working

Apr 26, 2011 | 08:43 PM

BCM

More Turbo

Joined: Feb 2011

Posts: 719

Likes: 17

Broken/bad connection, bad wire, bad contact, etc. A voltmeter will confirm that. Sears has em dirt cheap. AutoZone may even test it for you for free...

Trending Topics

F550 First Trip, Heavy tow, Noises / shudder

21

633
Looking for a canopy

14

290
Spark plug gaps vs AFR vs Heat buildup

15

259
Mustangman7 Restores A 1975 F150 Ranger XLT Supercab

34

860
The correct Carb? Tranny matters?

18

293

Apr 26, 2011 | 11:06 PM

Fallguy2004

Senior User

Joined: Jan 2005

Posts: 373

Likes: 2

From: Alberta, Canada

I would start by using a small pick that has a 90 degree bend in it to re bend out the pins on your trailer light socket on the truck. These pins wear down and bend closed so they don't interact with the trailer plug as well as they used to.
This happens more and more the more the trailer light socket is used.

After this I would start with a volt meter, seeing as you have already checked the fuse.