ok have any one had any probles with there plug in in the back where you huck your lights up for a trailer? i have a 24ft travel trailer. i pulled it a cuple weeks ago and all the lights was workin. i dont no much about the light outher then plug them in http://www.dieselplace.com/forum/smileys/Big%20Smile.gif. so heres what i need help with the trailer got turn lights and breaks light but no runin light could it be the trailer or truck need help please. thanks

I'd guess that something is wrong in the trailer and it blew the fuse on the truck to protect it.


Under the hood on left fender is a black plastic box.


Pull up on the lid and inside is the fuses, on the under side of lid is the fuse layout.


Find the fuse for the trailer marker lamps.


U can look at the end of the fuse and see if it is blown.


If it is blown, u need to find out why it blew.


Look at the cord that plugs into truck and ALL the lights/bulbs.

if the fuse was belw it wouldint have break lights and turn signals would it?

They are all seperate fuses, pop the lid and take a look.

Often it's the connection contacts are dirty on the trailer pigtail that plugs into the truck. Look in there, and if you see anything but gold color (clean copper) take an emory board (nail file) and some Contact Cleaner (available at auto parts stores) cut the emory board with scissors so it's narrow enough to go into the plug slots, and sand the surfaces. When you have the metal shiny, then clean it with contact cleaner. When you are done towing and park the trailer, cover the end of the pigtail with tape so water can't get in.


If you blew a fuse, you should have someone with experience look at it. A blown fuse means something is wrong and needs fixing. If you don't fix it, you can end up with all kinds of problems.


Edited by: McRat

ok i just went out to cheek the fuse and it was bad. now that i no it is the fuse i think i might no why it was rain when i huked it up that why it blew. im hopin but thinks for ya help lol i love this site!!!http://www.dieselplace.com/forum/smileys/Clap.gif

A wet plug shouldn't blow a fuse, GFCI yes but not 12VDC.


I'd bet u still have a wire/lite problem.


U aren't using the running lite circuit for power inside the camper?


did u put the 40 amp fuse in for the trailer hot line?

how can i run my inside lights in side the camper just off the truck batter? my last truck had a 12v set up for the lights in side the camper but this one want work like that is there a way i can set this up like that?

Trailer or slide in?

mcrat what you mean slide in or trailer. what im talkin about on my camper run the lights off my truck batter sorry if im not explaining it good.

A slide-in is a "camper" that sits in the bed of the truck.


There are camper trailers that you tow behind the truck as well.

ok mcrat im talkin about a pull behind trailer do you no a way i can run the in side lights for my truck batter?

Inside that black fuse box under the hood where you found the blown fuse is a spot for a 40amp fuse. It might have a Red B+ plastic cover on it. Buy a Green 40 amp fuse and plug it in and 1 of your 6 wires on the truck's trailer plug (I forget which 1, use a test light to find out) will be live now and that is used to power your trailer interior lights with. But don't forget if your truck's not running your not charging your batteries and if you leave the interior light's on long enough you could have a dead battery when you go to restart your truck.http://www.dieselplace.com/forum/smileys/Cry.gif Some people put seperate batteries in the trailers with isolator kit's to protect the truck's batteries from being drained, and then the trailer batteries are recharged when the truck is restarted


Diesel Dragon http://www.dieselplace.com/forum/smileys/Cool.gif

Diesel Dragon


hey i just cheek that out for the a 40amp fuse. It might have a Red B+ plastic cover on it theres nuthing out there that i saw i just seen to place that need a fuse one of them was for the foglamps and there outher one said (Stud 1*) could that be what your talkin about?

I think it was in the top left corner of the fuse box. If your looking at it from the driver's fender side.


I will check tomm for you if you haven't found it yet.


You need one of the Big 40 amp fuses not the little micro sized fuses.

ok if you can cheek for me let me no thanks agin

MIGHT LOOK FOR A WEBSTERS NEW EDITION TOOhttp://www.dieselplace.com/forum/smileys/HiHi.gif

Hey Peanut,

You, Sunny and Mark should get together. Maybe BOTH parties could benefit from proper capitalization. They could steal some big letters from you, and you could steal some little letters from them. Both of you have pleanty of each right now!

All would be easier to read.

HUKT UN FUNIKS WERKT FUR MI

NUT, I see u got the spell check installed.


Nice work.


Sunny, u have the brake wiring harness that came w/ your truck, it's in the glove compartment.


The 40amp fuse is taped to it.


The red B+ plastic plug needs removed.


U may have a label sruck over the top of them, if so peal it off and u will see the spot it goes.


Most trailers are already wired for the hot line.


Do u have a battery in trailer?


If u do the truck will(or can) charge that battery then when u park it unplug the plug and u won't run the batery down.

Dmax Tim





I looked and theres no 40amp fuse is not there where can i get them? Yes i have a batter on the trailer.

Get the fuse at any auto parts store. Advanced Auto, Napa what ever is near by, or if you have too stealer is an option.


And I was right about the fuse location, upper left looking at it from the drivers fender.


And Dmax Tim is right, after you park and shut the truck off just unplug the trailer plug from the truck and you can run on your internal trailer batt.


And did you find out what is wrong with the trailer wiring causing your fuse to blow?

Diesel Dragon





Thanks for the info. far as my trailer i have looked it over and over i cant figer out why it blew the fuse. i looked it the fuse box i see where your talkin about. thanks agin you have been a big help.

This is just a thought but, if someone didn't realize that the trailer battery power line just needed a fuse installed in the Under Hood Fuse Panel, and wanted to get power to the trailer battery, it would not take much rewiring on the trailer side to pull 12VDC from the marker lights and tie to the trailer charging line.


This would certainly kill a marker light fuse.


If this is the case Sunny, make sure that the trailer is properly wired at the plug or terminal box prior to anymore experiments. Otherwise, you going to have to buy some stock in a fuse company or worse. http://www.dieselplace.com/forum/smileys/Shocked.gif


If all else fails, you and Mark will have to road trip to Dmax Tim's and sweet talk him to help you out. I think he's closest to you.

where are you located at tim?

Fredericktown, exit 151 off I-71, then 15 miles or so northeast.