Troubleshooting No Trailer Power or Running Lights with Hopkins 7 Round to 7 Blade RV Adapter
Published 10/10/2019
Question:
I have a Pollak 7 pin plug-in on my truck I have a 7-way RV plug on my trailer I have a HM47425 adapter 7 way to 7 round pin but Im not getting a power source or my running lights is there a diagram for the 7 pin on what wires control what cuz it just has color abbreviations on where wire goes thank you
asked by: Frank D
Expert Reply:
It sound like some of the functions on your trailer wiring are not connected in the standard pin locations which is what both Pollak and Hopkins use.
On your trailer, locate the wires and pin location by function only as color coding is not standard across all manufacturers. Start by testing the 11:00 and 1:00 pin positions on your trailer with a circuit tester like # PTW2979; this is most likely where your wires are crossed. There could also be a short between these two circuits since they are side by side so inspect all wires going to those pins and replace/repair if necessary.
I recommend testing all pin functions just to make sure they are connected correctly and change their location if necessary to match the diagram below.
I have also attached a Trailer Wiring FAQ at the bottom of the page which includes additional diagrams and helpful information.
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Trailer Wiring
- Search Results: wiring harness 4 flat
- Shop: Tonneau Cover
- Shop: Trailer Hitch
- Q&A: Does etrailer Hitch for 2018 Nissan Frontier have Bracket for Wiring
- Article: Hard Tonneau Covers vs Soft Tonneau Covers
- Q&A: How to Install the Hopkins HM43534 7 Way Adapter On a 2014 Nissan Frontier
- Q&A: Troubleshooting Trailer Lights After Installing Hopkins Adapter 4 Pole to 7 Pole and 4 Pole # 37185
- Shop: RetraxONE MX Hard Tonneau Cover - Retractable - Polycarbonate - Matte Black - Stake Pocket Cutouts
- Video: What to Know About the RetraxONE MX Hard Tonneau Cover
- Video: 2022 Nissan Frontier RetraxONE MX Hard Tonneau Cover: Complete Installation
- Shop: Curt Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Shop: Truck Bed Mat
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Search Results: trailer hitch
- Video: Curt Powered Tail Light Converter Installation - 2023 Kia Telluride
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Video: How to Choose a Trailer Brake Controller
- Article: Trailer Wiring Diagrams
- Search Results: trailer wiring
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: How to Measure for Trailer Hitch Drop
- Video: Redarc Tow-Pro Liberty Brake Controller Review RED24FR
- Shop: Suspension Enhancement
- Search Results: trailer tires and wheels
- Shop: etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2"
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Q&A: Installation Time for Blue Ox BX1128 Flat Tow Base Plate Kit for 2016 Jeep Grand Cherokee
on Custom Fit Vehicle Wiring
