Lights Work on Trailer With One Vehicle But Not Other
Question:
I am trying to wire a 1975 Jayco travel trailer. We have all the wires ran appropriately, and when we connect the trailer to our 4runner, everything seems to work, but when we connect it to our F150, nothing seems to work unless my boyfriend connects a negative jumper cable from the bumper to the tongue of the trailer. We are assuming its a grounding issue, but is it on the truck or the trailer? We recently took the F150 to have the 7 way checked, because it was only partially working. When we got it back, all of the prongs light up on the circuit tester as they should, so we know the 7 way on the truck works. Where are we going wrong? Thanks in advance!
asked by: Paige
Expert Reply:
If the lights of your trailer work on your 4Runner but not your F-150 then the issue is on the truck; if it was the trailer then it wouldn't work with either vehicle. What I'm guessing is happening is that the pins on the 7-way of your F-150 are somewhat corroded. This can cause the connections to be problematic so you will want to check for that and clean them with some fine grit sandpaper.
You are also definitely always going to want to use Dielectric Grease for Electrical Connectors # 11755 to prevent any type of corrosion in your connectors in the future; using it will absolutely increase the durability and extend the lifespan of your connector.
Product Page this Question was Asked From
Dielectric Grease for Electrical Connectors, 2 oz.
- Accessories and Parts
- Trailer Wiring
- Wiring
- Dielectric Grease
- LubriMatic
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Search Results: junction box
- Shop: Trailer Wiring Junction Box - 7 Terminals - Polypropylene
- Q&A: Trailer Lights Work On One Vehicle But Not Another
- Search Results: ball cover
- Search Results: ball hitch cover
- Shop: Hopkins 7-Way RV Style Connector with Molded Cable - Trailer End - 8' Long - RV Standard
- Shop: Fastway Trailer Hitch Ball Cover with Tether - 2-5/16" Ball
- Shop: Trailer Wiring Junction Box
- Shop: Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS
- Shop: Bargman 7-Way, RV-Style Connector w/ 8' Heavy Duty Insulated Cable - Trailer End
- Shop: Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long
- Search Results: coiled trailer cord
- Search Results: connectors and fittings
- Video: Choosing the Right Trailer Wiring
- Search Results: brake controller
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Shop: Trailer Hitch
- Article: Trailer Wiring Diagrams
- Video: Choosing the Right Brake Controller
- Search Results: trailer brake controller
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Shop: Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: How to Choose the Right Trailer Hitch Class
- Shop: Suspension Enhancement
- Q&A: 7-Way Trailer Plug Adapter or Compatibility with Lance Slide-In Truck Bed Camper
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Shop: Brake Controller
- Q&A: My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug
on Accessories and Parts
