Chasing No left turn Signal on Trailer With Ram Truck

[SweetLou]

OK guys I have a new issue with this 2013 Ram 6.7. I had to pack some bearings in my utility trailer and afterward, I hooked up the truck and plugged into it to see about lights on the trailer. Found out left signal light not working. Later that day I connected our Subaru to the trailer and everything works. So then I hooked up another trailer I have to the truck and same issue, no left turn signal. The truck has at the bumper a seven pin, and 4 pin connection (all in one). I then tried the seven pin inside the bed to isolate which connector is bad, and guess what, no left signal there as well. So now the issue moves to wiring harness at the junction under the truck where the two split to see if there is power there.

Can anyone here tell me any tips in chasing this, or thoughts on if there is no power at the junction where you would go from there?

[SweetLou]

Groover wrote:
Now you should check your utility trailer for a short circuit. Wiring on trailers is often done very poorly.

Could only be two culprits. The Fifth Wheel, or my Cargo trailer. I think possibly the Fifth wheel. I was pulling it for a short one way trip when shortly on the drive and plugged into the bumper, the warning light came on saying trailer is disconnected. I pulled over and ended up switching the plug to the bed and it took care of it. May be there somewhere. Or my cargo trailer which has two sets of long LED lights on it and the upper left which is my problem side had 3-4 led lights burned out. Actually bought a replacement bank for it but never put it on. Now I'll check that side out first before replacing and doing damage to the new one.Thanks

[SweetLou]

enblethen wrote:
Thanks for the update! Glad I could help. Did you save the owner's manual?

I did! Great help. Thanks again!

[Groover]

Now you should check your utility trailer for a short circuit. Wiring on trailers is often done very poorly.

[enblethen]

Thanks for the update! Glad I could help. Did you save the owner's manual?

[SweetLou]

Me Again wrote:

SweetLou wrote:

enblethen wrote:
Check for a trailer connector fuse? Does the brake light work?
Looks like fuse 53
Fuse block

Brake lights work, I think. I need to check that again. Left signal works on truck so fuse 53 how could that be an issue if it works on the truck? Just asking

F53 = Trailer Tow – Left Turn/Stop Lights

Turned out a blown fuse. Didn't think about that until Enblethen mentioned it. Thanks guys for the help.

[Me_Again]

SweetLou wrote:

enblethen wrote:
Check for a trailer connector fuse? Does the brake light work?
Looks like fuse 53
Fuse block

Brake lights work, I think. I need to check that again. Left signal works on truck so fuse 53 how could that be an issue if it works on the truck? Just asking

F53 = Trailer Tow – Left Turn/Stop Lights

[mudfuel07]

Definitely check the fuses under the hood. I have a trailer that likes to short out the trailer signals almost every time, I need to change the lights on it and be done.

[enblethen]

You may find a PDF free owner's manual online!
Owner's manual
Look at page 678

[SweetLou]

enblethen wrote:
Fuse is for trailer connector. Truck lights are on it's own fuse.
Check your owner's manual

I wish I had an owners manual. Had it stolen while at a dealership. $75 for a new one. Now I know why their employee stole it

[enblethen]

Fuse is for trailer connector. Truck lights are on it's own fuse.
Check your owner's manual

[Michelle_S]

GM has fuses for Right and Left Trailer in the fuse block under the hood.

[jhgerhart]

I had a similar problem, but with a Ford. 10 years ago I added airbags. This year the trailer lights stopped working. Fuse OK, relay OK, now what?
I traced the wiring inch by inch and found that the tube to add air to the airbags was rubbing against the wiring harness. 10 years later, to wore through a wire. No damage to the airbag air tube, however.
Maybe no help to you, but you may have to trace the wire to see where it is broken.

[SweetLou]

enblethen wrote:
Check for a trailer connector fuse? Does the brake light work?
Looks like fuse 53
Fuse block

Brake lights work, I think. I need to check that again. Left signal works on truck so fuse 53 how could that be an issue if it works on the truck? Just asking

[enblethen]

Check for a trailer connector fuse? Does the brake light work?
Looks like fuse 53
Fuse block