4th Gen Ram Tech 2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

Trailer lights not working

Thread Tools
 
Search this Thread
 
Old May 5, 2022 | 10:28 AM
  #1  
Zack_TL64's Avatar
Zack_TL64
Thread Starter
|
Registered User
Joined: May 2022
Posts: 3
Likes: 0
Default Trailer lights not working

I have a 2009 Dodge Ram 1500 and when I tried attaching a trailer to it the lights don’t work I’ve checked both connections on the truck with a tester it’s comes back saying it’s working. Then I hooked the trailer up to my old man’s 2014 Silverado and it worked fine all lights turned on and functioned properly
 
Reply
Old May 5, 2022 | 02:04 PM
  #2  
HeyYou's Avatar
HeyYou
Administrator
Veteran: Air Force
Community Favorite
15 Year Member
Community Builder
Joined: Apr 2010
Posts: 87,396
Likes: 4,213
From: Clayton MI
Default

What kind of tester did you use? 4 or 7 pin connector?

On my 7 pin, everything would read properly with a multimeter, but, the trailer would have none of it. Cleaned the contacts on both sides, and it started working properly.
 
Reply
Old May 5, 2022 | 02:15 PM
  #3  
SHO Rod's Avatar
SHO Rod
Record Breaker
10 Year Member
Liked
Loved
Community Favorite
Joined: Feb 2015
Posts: 1,120
Likes: 53
From: Iowa
Default

Also is a factory trailer light wiring harness or something that was added aftermarket? Do you have an old style test light (incandescent versus LED)?

-Rod
 
Reply
Old May 5, 2022 | 03:18 PM
  #4  
Zack_TL64's Avatar
Zack_TL64
Thread Starter
|
Registered User
Joined: May 2022
Posts: 3
Likes: 0
Default

Originally Posted by HeyYou
What kind of tester did you use? 4 or 7 pin connector?

On my 7 pin, everything would read properly with a multimeter, but, the trailer would have none of it. Cleaned the contacts on both sides, and it started working properly.
both and on both it said it was working. What did you use to clean it?
 
Reply
Old May 5, 2022 | 06:18 PM
  #5  
SHO Rod's Avatar
SHO Rod
Record Breaker
10 Year Member
Liked
Loved
Community Favorite
Joined: Feb 2015
Posts: 1,120
Likes: 53
From: Iowa
Default

If the tester you used has LED indicators to determine if it's working, the LEDs will not load the circuit. So if any of the connections for the trailer wiring connections are corroded, they may light the LEDs but will NOT light typical trailer lighting since the corroded connections cannot pass sufficient current for the trailer lights. So I'm guessing HeyYou cleaned corrosion off the connections to get them working.

If your truck's trailer wiring was installed by an aftermarket installer and they didn't use a t-harness, there's a good chance they used Scotch-Loc connectors which are NOT intended for exterior use and have no sort of environmental seal. I've seen them used way too often and had to replace far too many feet of wiring because of the corrosion caused from their use.

-Rod
 
Reply
Old May 5, 2022 | 06:44 PM
  #6  
Zack_TL64's Avatar
Zack_TL64
Thread Starter
|
Registered User
Joined: May 2022
Posts: 3
Likes: 0
Default

Originally Posted by SHO Rod
If the tester you used has LED indicators to determine if it's working, the LEDs will not load the circuit. So if any of the connections for the trailer wiring connections are corroded, they may light the LEDs but will NOT light typical trailer lighting since the corroded connections cannot pass sufficient current for the trailer lights. So I'm guessing HeyYou cleaned corrosion off the connections to get them working.

If your truck's trailer wiring was installed by an aftermarket installer and they didn't use a t-harness, there's a good chance they used Scotch-Loc connectors which are NOT intended for exterior use and have no sort of environmental seal. I've seen them used way too often and had to replace far too many feet of wiring because of the corrosion caused from their use.

-Rod
thank you for the suggestion. I have a halogen test light so I’ll look into any shorts or corroded wiring
 
Reply
Old May 5, 2022 | 08:56 PM
  #7  
HeyYou's Avatar
HeyYou
Administrator
Veteran: Air Force
Community Favorite
15 Year Member
Community Builder
Joined: Apr 2010
Posts: 87,396
Likes: 4,213
From: Clayton MI
Default

Originally Posted by Zack_TL64
both and on both it said it was working. What did you use to clean it?
Electrical contact cleaner in a spray can, and a wire brush. After those, I just plugged/unplugged a few dozen times. Worked great after that.
 
Reply




All times are GMT -4. The time now is 10:06 AM.