Function of Center Pin on a 7-Way Trailer Connector
Updated 03/22/2020 | Published 11/14/2009
Question:
Etrailer 7 way trailer wiring diagram illustrates the center pole as auxiliary orange while the trailer color codes lists Back Up lights purple and no mention of auxiliary orange. Please explain the center pole. Also is 12volt red/ black the same circuit as battery charger black and Auxiliary what ever color?
asked by: Walt
Expert Reply:
The center pin on the 7 way connector can be used for many different purposes, although it is typically used to carry the signal from the reverse lights on the vehicle to the trailer. If the trailer does not have reverse lights or a reverse lockout for hydraulic surge activated trailer brakes, this pin can be used for any purpose such as providing an additional 12 volt circuit for any accessories on the trailer.
The dedicated 12 volt accessory circuit, # 4 in the 1 O'clock position on the connector, see photo, can be used to maintain a trailer mounted battery, or for any other accessories installed on the trailer such as interior lighting.
Featured Help Information
Miscellaneous Media
Continue Researching
- Search Results: ramp springs
- Search Results: gen y ramps
- Search Results: trailer ramp springs
- Search Results: blue ox patriot brake system
- Search Results: ramp spring
- Shop: Lippert Magnet Kit for 12-1/4" Electric Trailer Brake Assemblies - 8,000 lbs to 16,000 lbs
- Shop: Conventional Ramp Door Spring for 7' Wide Enclosed Trailer - Single Spring - 120-lb Capacity
- Search Results: roadmaster diode 7~wire to 6~wire flexo~coil wiring kit
- Search Results: blue ox bx88206
- Shop: etrailer RapidRamps 6' Long Bolt-On Trailer Ramps for over 6-1/2' Wide Trailers
- Q&A: Replacement Hardware List for the B&W Turnoverball Gooseneck Hitch
- Q&A: Recommended 7-Way to 6-Pole Flat Tow Trailer Connector That Works w/a Charge Line
- Shop: Vehicle Tow Bar Wiring
- Video: The Low-Down on the Blue Ox 7-Wire to 6-Wire, Coiled Electrical Cord
- Shop: Air Lift 1000 Air Helper Springs for Coil Springs - Rear
- Shop: Roadmaster Nighthawk All-Terrain Tow Bar for Blue Ox Base Plate - Non-Binding - LEDs - RV Mount - 8K
- Shop: Roadmaster Universal Hy-Power Diode Wiring Kit
- Shop: Blue Ox Base Plate Kit - Removable Arms
- Article: The Best Electric Trailer Jacks of 2025
- Video: In-Depth Review of the Lippert Electric Trailer Jack with Footplate
- Video: Let’s Check Out the Prest-O-Fit Wraparound Exterior RV Step Rug
- Video: Prest-O-Fit Wraparound Exterior RV Step Rug Review
- Article: Trailer Wiring Diagrams
- Q&A: Looking For Electric Jack That Can Be Rotated 90 Degrees
- Q&A: Why Isn't There Swivel Foot Available for etrailer Jack e23ZV
- Q&A: Brake Controller Installation Instructions for a 2006 Toyota Tundra with Factory Tow Package
- Q&A: Testing Electric Brakes on Trailer without Connecting to Tow Vehicle
- Shop: Suspension Enhancement
- Q&A: Why Does My Furrion Vision S Camera Only Come on When the Tow Vehicle Lights Are On
- Video: Review of Blue Ox SwayPro Weight Distribution Shank 2 Inch Hitch - BLU64ER
Bob
3/20/2020
#4 is in 11 oclock or 1 oclock in that photo