Troubleshooting Hopkins 7-Way Trailer Connection for Fix or Replacement
Question:
I had the trailer dealer install a 7 pin/4 pin combination unit on my truck.they installed a Hopkins unit and it has been nothing but trouble. My horse trailer factory plug never fitted like it should and lights didnt work. I took truck and trailer and tech said it was a bent pin. Now I plug it in and the same problem. With the 7 pin round plug the signal lights work but when I turn on running lights they dont work and the truck backup lights are on. How do I check for bent pin as the unit is sealed? All the pins check good with a tester. Everything works on the 4 pin flat plug. I am thinking just get another brand and replace the plug. Any suggestions?
asked by: David M
Expert Reply:
The Hopkins brand connectors are normally pretty good. All trailer connectors can have issues with connections like this due to corrosion or moisture in the connection. I recommend using some sand paper to clean the pins and then use dielectric grease # 11755 to keep moisture and corrosion off the pins. A bent pin is an issue if it keeps bending because it weakens and can cause a connection issue. Normally when a function doesn't work, it is a ground connection issue, and I recommend ensuring your ground contact is bare metal to metal and free of corrosion or debris. I recommend using a circuit tester like # PTW2993 to confirm a solid ground for all functions. When another function has power when it should not, normally that is due to corrosion causing a bridge between pins and cleaning is the best fix.
If you decide you want another brand, I recommend the Curt Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps # C57674.
Products Referenced in This Question
Dielectric Grease for Electrical Connectors, 2 oz.
- Accessories and Parts
- Trailer Wiring
- Wiring
- Dielectric Grease
- LubriMatic
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Product Page this Question was Asked From
Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps
- Trailer Wiring
- Wiring Adapters
- Multi-Function Adapter
- 4 Flat
- Plug and Lead
- 4 Flat
- 7 Round - Blade
- CURT
more information >
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