7 Pin Trailer Wiring Diagram and Pin Finder
Choose the connector and the face you are looking at. Tap a contact to find its circuit. All four views keep the key or latch at the top.
Reviewed 2 primary sourcesSee sources
Choose the connector type to show a pin map.
7-way RV blade · Vehicle socket · Contacts facing you (front) · Key / latch at top
Keep the key or latch at the top. Positions are schematic.
Tap a contact or choose a circuit.
Ground
Lower-left
Colors hidden
Colors can differ on your harness. Identify the circuit by function and the instructions for your exact connector. The center can have another use.
- +12V: +12V auxiliary power
- TAIL: Tail / running lights
- RIGHT: Right stop / turn lamps
- LEFT: Left stop / turn lamps
- BRAKES: Electric wheel brakes
- GND: Ground
- REV: Reverse lights
Reviewed 2026-10-20. CURT, Understanding Towing p. 16; Roadmaster 854959-03 (outer front contacts). Center reverse follows CURT. rvstopguide.com/towing/7-way-trailer-wiring/
Does this diagram match your connector?
Look at the contacts, not just the round housing. The supported RV-blade connector has six flat outer contacts around a center contact. Seven round contacts need a different diagram. Do not use these maps for a vehicle-side USCAR harness connection.[1]
All four views
“Front” means the mating contacts face you. “Rear” means you are looking from the wire-entry side. Turning it around reverses left and right. Keep the key at the top in both views.
Vehicle socket · Front / contacts
- +12V — +12V auxiliary power: upper right
- TAIL — Tail / running lights: upper left
- RIGHT — Right stop / turn lamps: right
- LEFT — Left stop / turn lamps: left
- BRAKES — Electric wheel brakes: lower right
- GND — Ground: lower left
- REV — Reverse lights: center
Vehicle socket · Rear / wire entry
- +12V — +12V auxiliary power: upper left
- TAIL — Tail / running lights: upper right
- RIGHT — Right stop / turn lamps: left
- LEFT — Left stop / turn lamps: right
- BRAKES — Electric wheel brakes: lower left
- GND — Ground: lower right
- REV — Reverse lights: center
Trailer plug · Front / contacts
- +12V — +12V auxiliary power: upper left
- TAIL — Tail / running lights: upper right
- RIGHT — Right stop / turn lamps: left
- LEFT — Left stop / turn lamps: right
- BRAKES — Electric wheel brakes: lower left
- GND — Ground: lower right
- REV — Reverse lights: center
Trailer plug · Rear / wire entry
- +12V — +12V auxiliary power: upper right
- TAIL — Tail / running lights: upper left
- RIGHT — Right stop / turn lamps: right
- LEFT — Left stop / turn lamps: left
- BRAKES — Electric wheel brakes: lower right
- GND — Ground: lower left
- REV — Reverse lights: center
CURT supplies the two rear views. Roadmaster’s front drawings independently confirm the six outer positions. Looking at the other face reverses left and right while the key stays at the top.[1][2]
7-way RV wire color examples
These are the two examples in CURT’s guide. Changing between them changes color names, not circuit positions. An installed wire can use a different color.[1]
| Circuit | Traditional RV example | CURT SAE example |
|---|---|---|
| +12V auxiliary power | Black | Orange |
| Tail / running lights | Green | Brown |
| Right stop / turn lamps | Brown | Green |
| Left stop / turn lamps | Red | Yellow |
| Electric wheel brakes | Blue | Blue |
| Ground | White | White |
| Reverse lights | Yellow | Gray |
Before using the map
- This map covers the North American 7-way RV blade family. It does not cover seven round pins, European or Australian connectors, or the vehicle-side USCAR harness connection.[1]
- Wire colors are examples, not a way to identify an unknown circuit. Follow the instructions and markings for your exact connector and verify the circuit functions before connecting.[1]
- The center is reverse in CURT’s RV-blade example. Roadmaster labels it auxiliary/access and leaves it unused in its illustrated application. A matching shape does not prove that your center contact is wired for reverse.[2]
Which contact is for trailer brakes?
The electric wheel-brake circuit is separate from the left and right stop/turn lamp circuits. Choose “Electric wheel brakes” in the finder to see the contact for your selected half and face.[1]
Why use function names instead of pin numbers?
A number without the connector family and viewing face can be ambiguous. This finder uses circuit names and positions. Use your connector manufacturer’s terminal markings when following its instructions.
Sources
Original schematic diagrams based on the manufacturer documents below. The six outer front contacts were cross-checked separately; the center follows CURT’s RV-blade example. We have not tested an installed harness.
- Understanding Towing: plugs, sockets and adapter wiring guideCURT · PDF page 9, printed page 16: representative rear views; RV-blade traditional and SAE-labeled color tables. · retrieved
- Plug and socket wiring diagramsRoadmaster · 854959-03 (06-25) · Page 1, bottom pair: front of 7-wire plug and socket. Used to cross-check six outer contact positions; center is application-specific. · retrieved
Primary publishers: CURT, Roadmaster. Spotted an error? Email the address in the footer with the model and the document you are using.