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trailer lights question

Posted on 7/31/15 at 4:00 pm
Posted by mack the knife
EBR
Member since Oct 2012
4265 posts
Posted on 7/31/15 at 4:00 pm
LED lights:
brake lights work

hazard lights work

running lights dont come on when truck head lights are on

help and tia
Posted by weagle99
Member since Nov 2011
35893 posts
Posted on 7/31/15 at 4:01 pm to
Ground
Posted by Ole Geauxt
KnowLa.
Member since Dec 2007
50880 posts
Posted on 7/31/15 at 4:03 pm to
I hate chasing down that crap,, easier to have a spare trailer and when one messes up, buy a new one.
Posted by mack the knife
EBR
Member since Oct 2012
4265 posts
Posted on 7/31/15 at 4:05 pm to
additional info:

i have breaks on trailer

plugs straight in to truck w/o an addapter - if that makes a difference
Posted by Hangover Haven
Metry
Member since Oct 2013
32055 posts
Posted on 7/31/15 at 4:16 pm to
check your wiring for any breaks.. especially where it comes out of the trailer... Happened with mine, had to replace the wiring..
This post was edited on 7/31/15 at 4:19 pm
Posted by cgrand
HAMMOND
Member since Oct 2009
46664 posts
Posted on 7/31/15 at 4:31 pm to
i stopped even trying...
whenever mine go on the blink i strip everything off and re-wire

Posted by weagle99
Member since Nov 2011
35893 posts
Posted on 7/31/15 at 4:40 pm to
90% of trailer light problems are related to a bad ground in my experience.

Do you have a test light to start checking out the connections?

Posted by Clyde Tipton
Planet Earth
Member since Dec 2007
40573 posts
Posted on 7/31/15 at 4:49 pm to
If it's a newer Ford you blew fuse #31 under the hood.

It's happened to my 2009 f150 twice. Everything works but the running lights when it blows.
Posted by Who Me
Ascension
Member since Aug 2011
7090 posts
Posted on 7/31/15 at 4:53 pm to
quote:

If it's a newer Ford you blew fuse #31 under the hood


I have done this with my F150 as well.

Also have a friend with a GMC that blew a fuse under the hood of his truck.

It is likely the ground but make sure and check the fuses on your truck if it is a recent model it will have an entire set just for trailer lights.
Posted by Clyde Tipton
Planet Earth
Member since Dec 2007
40573 posts
Posted on 7/31/15 at 4:56 pm to
quote:

It is likely the ground


I think the others wouldn't be working if it was a ground issue. Only the running lights being out is indicative of a fuse that only controls that feature of the light. Thus, everything else still works.

Posted by Who Me
Ascension
Member since Aug 2011
7090 posts
Posted on 7/31/15 at 5:04 pm to
Maybe so. I am certainly not an expert at trailer lights or an electrician but I have seen trailer lights do some strange things.

Posted by Nodust
Member since Aug 2010
22764 posts
Posted on 7/31/15 at 5:20 pm to
quote:

quote:
It is likely the ground


I think the others wouldn't be working if it was a ground issue. Only the running lights being out is indicative of a fuse that only controls that feature of the light. Thus, everything else still works.


Bad ground does crazy things. I would start there. Easy to do anyway.
Posted by sloopy
Member since Aug 2009
6902 posts
Posted on 7/31/15 at 6:52 pm to
You have brake lights, just ride dirty...
Posted by Nascar Fan
Columbia La.
Member since Jul 2011
18586 posts
Posted on 7/31/15 at 7:09 pm to
quote:

whenever mine go on the blink i strip everything off and re-wire

This is the best idea BUT i'll change bulbs, look for a ground faulty wire spray electric clean & then re-wire
Posted by baseballkicker
Member since Dec 2011
102 posts
Posted on 7/31/15 at 7:18 pm to
Check at the plug on the truck where the trailer plugs in to. Sometimes they are cheap butt connectors and corrosion will set in. Maybe as simple as wiggling the connector. If you have a boat trailer a test light is a must. They are $3 or $4 at Walmart. Well worth it.
Posted by tiger chaser
Birmingham Ala
Member since Feb 2008
7721 posts
Posted on 7/31/15 at 9:13 pm to
Check you fuses.
Posted by tilco
Spanish Fort, AL
Member since Nov 2013
14308 posts
Posted on 7/31/15 at 9:17 pm to
quote:

Check you fuses.
Posted by mack the knife
EBR
Member since Oct 2012
4265 posts
Posted on 8/1/15 at 7:17 am to
damn plug ends were loose and dirty. sprayed with kroil, bent tabs tight with screwdriver = fixed
Posted by FrenchJoe
H 861
Member since Aug 2006
1038 posts
Posted on 8/1/15 at 7:33 am to
1. Ground (12 volt test light will help)
2. Corrosion at some connection. (dielectric paste on connections will help)
3. Fuses (on one occasion I blew a fuse but usually it's a ground problem)

When replacing tail light fixtures use dielectric paste, crimp butt connectors covered with heat shrink.
Posted by jeffsdad
Member since Mar 2007
24105 posts
Posted on 8/1/15 at 7:42 am to
I think Clyde has your answer. Same thing happened to my neighbor....replaced a lot of wiring, and then found out it was a bad fuse (even tho it he checked that first).
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