Parts Needed to Install a 7-Way Trailer Connector to a 2003 Land Rover Discovery II
Question:
My LandRover has factory installed trailer connection plug in the right rear tail light. I purchased the harness. All plugs fit and matchup. However, there are 3 wires sticking out of the harness attached to nothing which end behind the tail light lensewhere the connetion is Where do I connect the 3 wires that are coming out the side of the harness?The harness kit from Dealer has an adaptor included to convert from the factory 7 round to a 4 flat to a 7 flat which matches the trailer male plug. I dont think all pins are matching each other wire purpose with the correct wire. In turn, I needed an adaptor from Pollak # 12-723EV to connect this and also to connect to the trailers 7 blade, plug. The adaptor from Pollak also has 3 wires 4counting the white ground wire the 3 wires are purple, blue and black.I have no trailer lights at all when plugged in. My question: Where do the 3 wires sticking out of harness on vehicle side and the 3 wires on the Pollak adaptor go? Do I connect them together ? Both 4 flat connections vehicleandtrailer adaptors wires match color to color brown,white,greenandyellow Also, is it okay to change the trailers wire,pin location to match the adaptor #12-723EV ? Since the two 4 Flat connections seem to match, I dont want to cut, splice and possibly alter the vehicle sidewiring,harness ect.. Thank you for your help!!
asked by: Tim
Expert Reply:
You can determine the wire functions on the vehicle by testing them with a circuit tester like # 40376. The wire that shows 12 volt power all the time is the hot lead, the wire that only comes on with the reverse lights is the reverse light circuit, the last wire will be for brake controller out put.
The wiring harness I show for a 2003 Land Rover Discovery II is # 119178KIT which would require splicing into the vehicle wiring behind the tail lights. It sounds like you are using a different harness. When adding a 7-Way to this vehicle, we recommend the above wiring harness and a 7-Way trailer connector using # ETBC7.
With the ETBC7, you will plug in the 4-Way to the back of the unit. The white wire will need to ground to the vehicle frame, the purple wire connects to the reverse light circuit, the blue wire is output from a brake controller, and the black wire connects to the vehicle battery via a 40 amp circuit breaker. I have included some links that will help explain an ETBC7 installation.
It sounds like the harness you have has wires for 12 volt power, brake output, and reverse lights. On a 7-Way, they will connect to the back of the plug as follows:
12 volt = pin in 11 oclock position
brake = pin in 7 oclock position
reverse lights = center pin
I have included a link to a wiring FAQ that should help. You will need a circuit tester like # 3808, to test vehicle side wires for function. It is fine to change the pin out on the trailer side connector to match the adapter.
Products Referenced in This Question
Tekonsha Tail Light Converter with 4-Way Flat Trailer Connector and Install Kit
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Converter
- 1-1/2 Feet Long
- Universal Fit
- 4 Flat
- Tekonsha
more information >
Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Accessories and Parts
- Trailer Brake Controller
- Installation Kits
- etrailer
more information >
Product Page this Question was Asked From
7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- No Converter
- Custom Fit
- 7 Round - Blade
- 4 Flat
- Hopkins
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Video: All About the Safety Chain with 2 Hooks for Gen-Y 5th Wheel to Gooseneck Pin Box
- Shop: Trailer Wiring
- Search Results: brake control harness
- Shop: Trailer Connector Adapter for Land Rover - 7-Way, Round Pin, European Style to 4-Way Flat
- Shop: Safety Chain with 2 Hooks for Gen-Y 5th Wheel to Gooseneck Pin Box - 84" Long - 26,000 lbs
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Shop: Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Toyota and Lexus
- Shop: Brake Controller
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Q&A: Wiring Tow Vehicle to Work With Curt C51180 Echo
- Shop: Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Ram
- Shop: Replacement Crimp Ring for 1/2" Flair-It PEXLock RV Plumbing Fittings - Qty 3
- Shop: Hopkins Vehicle Wiring Harness with 7-Way RV-Style Connector
- Q&A: Installing the Tekonsha Prodigy P3 on a 2004 Land Rover Discovery II
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Search Results: trailer wiring
- Shop: Trailer Hitch
- Video: Finding the Right Trailer Wiring Harness
- Search Results: trailer hitch
- Article: Trailer Wiring Diagrams
- Video: How to Choose a Trailer Brake Controller
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: What Is An OEM Prep Package And How Do I Know If I Have It
- Video: Redarc Tow-Pro Liberty Brake Controller Review RED24FR
- Search Results: brake controller
- Search Results: trailer brake controller
- Shop: Gooseneck Hitch
- Article: Brake Controller Installation: Starting from Scratch
- Shop: Fifth Wheel Hitch
on Custom Fit Vehicle Wiring
