- Catalog
- Find A Branch
- KeepStock
- Help
- 1-800-GRAINGER
Sign In
Sign In to access your account information.
Sign In Register Forgot User ID? Forgot Password?All Products
Unrelated Links
Product Categories
- All Product Categories
- Abrasives
- Adhesives, Sealants and Tape
- Cleaning and Janitorial
- Electrical
- Electronics & Batteries
- Fasteners
- Fleet & Vehicle Maintenance
- Furnishings, Appliances & Hospitality
- HVAC and Refrigeration
- Hardware
- Hydraulics
- Lab Supplies
- Lighting
- Lubrication
- Machining
- Material Handling
- Motors
- Office Supplies
- Outdoor Equipment
- Packaging & Shipping
- Paints, Equipment and Supplies
- Pipe, Hose, Tube & Fittings
- Plumbing
- Pneumatics
- Power Transmission
- Pumps
- Raw Materials
- Reference and Learning Supplies
- Safety
- Security
- Test Instruments
- Tools
- Welding
Sign In
Sign In to access your account information.
Sign In Register Forgot User ID? Forgot Password?Trailer Electrical & Braking
Trailer electrical wiring and harness plugs replace worn parts in vehicle electrical connections. The most basic design is the color-coded 4-pin system that uses a brown wire for tail, license, and side marker lights, yellow wire for left hand stop and turn, green wire for right hand stop and turn, and white wire for system ground. 6-pin connectors have one terminal each for electric brake controls and 12-volt accessories, in addition to connections for turn signals, brake lights, taillights and ground. 6-pin connectors come in square and round styles and are common to gooseneck and fifth wheel trailers, boat trailers and campers. 7-pin connectors are commonly found on new vehicles that are prewired for towing.