Silverado 7 Pin Trailer Wiring Diagram: All Years
The Silverado 7 pin trailer wiring diagram uses seven circuits for left turn and brake, tail lights, reverse lights, auxiliary battery power, right turn and brake, electric trailer brakes, and ground. On newer Silverado trucks, GM uses a round seven-way connector with flat-blade terminals meeting SAE J2863 specifications.
Do not wire a replacement socket by color alone. Chevrolet changed several factory harness colors across Silverado generations, and even the left and right stop-turn colors differ between some model-year manuals.
The safest method is simple: identify the terminal by function and connector position first, then verify its wire with a multimeter or circuit tester.
Silverado 7 Pin Trailer Wiring Diagram
Vehicle-side socket view. Match each terminal by circuit function first, then verify the factory wire color for your exact Silverado year.
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Vehicle-Side 7-Way Socket View
SOCKET
7 Pin Functions
| Circuit | 2007–2013 | 2017–2018 | 2019 Silverado LD | 2019 New Body | 2021–2023 Verified |
|---|---|---|---|---|---|
| Left Stop and Turn | Yellow | Yellow/Gray | Yellow/Blue | Yellow/Blue | Yellow/Blue |
| Right Stop and Turn | Dark Green | Green/Violet | Green/Brown | Green/Violet | Green/Violet |
| Tail and Parking | Brown | Gray/Brown | Gray/Brown | Gray/Brown | Gray/Brown |
| Reverse | Light Green | White/Green | White/Green | White/Green | White/Green |
| 12V Battery Feed | Red | Red/Green | Red/Violet | Red/Green | Red/Green |
| Trailer Brake | Dark Blue | Blue | Blue | Blue | Blue |
| Ground | White | White | Black | White | White |
How the Silverado 7 Pin Connector Is Oriented
The most important part of any Silverado trailer wiring diagram is knowing which side of the connector you are viewing.
GM’s diagram shows the truck-side seven-pin receptacle viewed from the front, where the trailer plug inserts. If you remove that receptacle and look at its wiring terminals from behind, the layout can appear reversed.
GM numbers the seven terminals as follows:
| Pin | Trailer Circuit | Function |
|---|---|---|
| 1 | Left Turn and Brake | Left trailer turn signal and stop lamp |
| 2 | Tail Lights | Running, marker, and tail lamps |
| 3 | Reverse Lights | Trailer backup lamps |
| 4 | Battery Feed | Auxiliary trailer power circuit |
| 5 | Right Turn and Brake | Right trailer turn signal and stop lamp |
| 6 | Electric Brakes | Trailer brake-controller output |
| 7 | Ground | Electrical ground return |
This numbered arrangement comes directly from Chevrolet’s Silverado documentation. (Chevrolet)
Truck-side socket view: always use the pin locations above while looking directly into the receptacle on the Silverado. Do not copy the same clock positions onto the back of an aftermarket connector unless its manufacturer identifies those terminals the same way.
What All 7 Silverado Trailer Pins Actually Do
Each Silverado 7-way terminal has a separate job. Understanding that job is more useful than memorizing wire colors.
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Left and Right Stop Turn Circuits
Pins 1 and 5 carry the combined stop and turn-signal circuits.
The left circuit flashes the trailer’s left signal and illuminates that side during braking. The right circuit performs the same job on the opposite side.
This is why a failure on one stop-turn circuit can affect both the brake lamp and turn signal on that side.
Tail Light Circuit
Pin 2 powers the trailer’s tail, running, and marker lamps.
If your brake lights work but all running lights are dead, this circuit should be checked separately instead of replacing the complete seven-pin receptacle.
Reverse Light Circuit
Pin 3 supplies the trailer’s reverse-light circuit.
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This connection may also be used by compatible trailer equipment that requires a reverse signal, but wiring should follow the trailer manufacturer’s instructions.
Battery Feed Circuit
Pin 4 is the trailer auxiliary battery-feed circuit.
It can supply power for compatible trailer equipment or support battery charging, but its behavior varies by Silverado generation and electrical configuration. Some earlier trucks require the related fuse or underhood connection to be installed before the circuit works. For example, Chevrolet’s 2012 manual states that the battery-feed circuit may require an underhood connection. (Chevrolet)
Electric Trailer Brake Circuit
Pin 6 carries output from the electric trailer brake controller.
This is not simply another constant 12-volt feed. Brake-controller output changes according to controller operation and braking demand.
If you are setting up the controller after repairing the connector, our trailer brake controller setup guide explains gain adjustment and manual override operation.
Ground Circuit
Pin 7 is the trailer ground.
A poor ground can make several unrelated circuits behave strangely at the same time. Before chasing multiple lighting faults, verify this circuit and inspect both the truck connector and trailer plug for corrosion.
Silverado Trailer Wiring Colors From 2006 to 2013
Older GMT800 and GMT900 Silverado trucks use a simpler GM color pattern than later K2XX and T1 trucks.
Chevrolet’s 2006 manual identifies an eight-wire heavy-duty harness. Seven wires serve the standard trailer circuits, while a separate light-blue wire supplies the Center High-Mounted Stop Lamp, or CHMSL. (Chevrolet)
2006 Silverado Factory Wiring Colors
| Function | GM Wire Color |
|---|---|
| Left Stop and Turn | Yellow |
| Right Stop and Turn | Dark Green |
| Tail Lamps | Brown |
| Ground | White |
| Reverse Lamps | Light Green |
| Battery Feed | Red |
| Trailer Brake | Dark Blue |
| CHMSL Additional Circuit | Light Blue |
The light-blue CHMSL wire is not an eighth pin in the seven-way socket. GM provided it as an additional circuit for applications such as campers and caps. (Chevrolet)
2007 to 2013 Silverado Factory Wiring Colors
The main seven trailer functions continued with the following pattern in documented 2007, 2010, 2012, and 2013 Silverado manuals:
| Function | GM Wire Color |
|---|---|
| Left Stop and Turn | Yellow |
| Right Stop and Turn | Dark Green |
| Tail Lamps | Brown |
| Ground | White |
| Reverse Lamps | Light Green |
| Battery Feed | Red |
| Trailer Brake | Dark Blue |
Chevrolet’s 2007, 2010, 2012, and 2013 documentation confirms this group of circuit colors. Some 2007 configurations also include a separate CHMSL lead. (GM Assets)
On some 2008 to 2012 trucks, Chevrolet notes that battery-feed or trailer-brake wiring may require an underhood connection or fuse arrangement depending on equipment. Do not assume a dead battery-feed pin means the rear connector itself has failed. (ManualsLib)
Silverado Trailer Wiring Colors From 2014 to 2018
The 2014 generation introduced multi-color circuit wires such as Gray/Brown, White/Green, and Red/Green.
There is one particularly important complication: Chevrolet manuals from this period do not all assign Green/Violet and Yellow/Gray to the same side.
2014 to 2016 Silverado Colors
Chevrolet’s 2014, 2015, and 2016 documentation lists:
| Function | Documented Wire Color |
|---|---|
| Left Stop and Turn | Green/Violet |
| Right Stop and Turn | Yellow/Gray |
| Tail and Parking Lamps | Gray/Brown |
| Ground | White |
| Reverse Lamps | White/Green |
| Battery Feed | Red/Green |
| Trailer Brake | Dark Blue |
These assignments appear in the 2014 through 2016 GM manuals. (Experience GM)
2017 to 2018 Silverado Colors
Chevrolet’s 2017 and 2018 manuals show the left and right stop-turn assignments the opposite way:
| Function | Documented Wire Color |
|---|---|
| Left Stop and Turn | Yellow/Gray |
| Right Stop and Turn | Green/Violet |
| Tail and Parking Lamps | Gray/Brown |
| Ground | White |
| Reverse Lamps | White/Green |
| Battery Feed | Red/Green |
| Trailer Brake | Dark Blue or Blue |
The 2017 official manual identifies Green/Violet as right stop-turn and Yellow/Gray as left stop-turn. The 2018 manual does the same. (Chevrolet)
Do not assume the two stop-turn wires based on color on a 2014 to 2018 truck. Check your exact model-year manual and confirm the circuit electrically before cutting or splicing.
That one test can prevent the common problem of swapping the left and right trailer signals.
How 2019 Silverado LD Wiring Differs
The 2019 model year needs special attention because Chevrolet sold both the carryover Silverado LD architecture and the redesigned Silverado 1500.
The 2019 Silverado LD and related legacy HD manual identifies these colors:
| Circuit | 2019 Silverado LD Wire |
|---|---|
| Left Stop and Turn | Yellow/Blue |
| Right Stop and Turn | Green/Brown |
| Tail and Parking Lamps | Gray/Brown |
| Reverse Lamps | White/Green |
| Battery Feed | Red/Violet |
| Ground | Black |
| Electric Trailer Brake | Blue |
These values are documented in the 2019 Silverado LD 1500 and Silverado 2500/3500 manual. (Car Manuals Online)
The two colors that should immediately catch your attention are Red/Violet for battery feed and Black for ground. Those differ from the redesigned 2019 Silverado 1500.
How 2019 New Body Silverado Wiring Differs
The redesigned 2019 Silverado 1500 uses another GM color combination.
| Circuit | 2019 New Body Wire |
|---|---|
| Left Stop and Turn | Yellow/Blue |
| Right Stop and Turn | Green/Violet |
| Tail and Parking Lamps | Gray/Brown |
| Reverse Lamps | White/Green |
| Battery Feed | Red/Green |
| Ground | White |
| Electric Trailer Brake | Blue |
Chevrolet documents these exact circuits in its 2019 Silverado owner manual. (Chevrolet)
Here is the change that matters most when repairing a 2019:
| Circuit | Silverado LD | New Body Silverado |
|---|---|---|
| Left Stop and Turn | Yellow/Blue | Yellow/Blue |
| Right Stop and Turn | Green/Brown | Green/Violet |
| Tail Lamps | Gray/Brown | Gray/Brown |
| Reverse Lamps | White/Green | White/Green |
| Battery Feed | Red/Violet | Red/Green |
| Ground | Black | White |
| Trailer Brake | Blue | Blue |
Do not buy a pigtail, cut the factory wires, and follow a diagram labeled only “2019 Silverado.” Determine whether you have the LD or redesigned truck first.
Silverado 7 Pin Wiring From 2020 to 2026
The redesigned Silverado retained the same basic seven trailer functions in later models.
The verified 2021 Silverado 1500 and 2500HD manuals identify:
| Circuit | GM Wire Color |
|---|---|
| Left Stop and Turn | Yellow/Blue |
| Right Stop and Turn | Green/Violet |
| Tail and Parking Lamps | Gray/Brown |
| Reverse Lamps | White/Green |
| Battery Feed | Red/Green |
| Ground | White |
| Electric Trailer Brake | Blue |
Both Silverado 1500 and HD documentation show this same color set for 2021. (Car Manuals Online)
Chevrolet’s 2023 Silverado 1500 manual also documents Yellow/Blue, Green/Violet, Gray/Brown, White/Green, Red/Green, White, and Blue for those seven circuits. (GM Answers)
For 2025, GM’s Trailering App can display connector-pin status and identify lighting faults involving right turn, left turn, running, and reverse circuits on equipped trucks. (GM Answers)
The 2026 Silverado/Sierra towing documentation still defines the connector functions as:
- Left Turn and Brake
- Tail Lights
- Reverse Lights
- Battery Feed
- Right Turn and Brake
- Electric Brakes
- Ground
It also continues to specify a round seven-wire flat-blade connector meeting SAE J2863. (device.report)
For 2024 to 2026 harness repair, use this standardized pin-function layout, but verify the factory wire colors against the exact truck’s electrical information before cutting into the harness. That approach avoids extrapolating a color code where GM documentation for the exact configuration has not been checked.
Where the Silverado 7 Pin Connector Is Located
Silverado trucks with the factory heavy-duty trailering package typically place the seven-way connector at the rear bumper.
GM also uses another connector location on trucks equipped with the factory fifth-wheel or gooseneck trailering package. Chevrolet’s 2019 and 2023 documentation places that connector inside the pickup bed behind the rear wheel. (Chevrolet)
Some trucks without a bumper receptacle have the seven-wire harness secured to the frame and require a connector to be installed.
Check for factory wiring before running a completely new harness from the front of the truck.
How to Test All 7 Silverado Trailer Pins
Testing each circuit is safer than trusting an aftermarket connector’s wire colors.
Use a digital multimeter or 12-volt circuit tester and work from the function shown in the Silverado 7 pin trailer wiring diagram.
1. Inspect the Connector First
Open the socket lid and inspect the blades for green corrosion, moisture, bent contacts, burned terminals, or loose connections.
GM warns that contamination such as mud, salt, dirt, and water can affect trailer connector security and electrical operation. (device.report)
2. Confirm the Ground Pin
Connect the meter’s negative lead to Pin 7 or another known-good chassis ground.
If the ground circuit itself is questionable, test continuity between the ground terminal and a clean chassis point before checking the powered circuits.
3. Test the Tail Light Pin
Turn on the Silverado’s parking lamps.
Pin 2 should become active while the running lights are commanded on.
4. Test the Left Stop Turn Pin
Activate the left turn signal and probe Pin 1.
The meter or test lamp should pulse with the turn signal. Pressing the brake pedal should activate the stop function on the same circuit.
5. Test the Right Stop Turn Pin
Repeat the test on Pin 5 with the right turn signal.
A working left side and dead right side point toward a right-side circuit problem rather than a failed ground affecting the complete connector.
6. Test the Reverse Pin
Secure the truck so it cannot move, set the parking brake, and use a helper before selecting Reverse.
Probe Pin 3 while the reverse circuit is active.
7. Test the Battery Feed
Probe Pin 4 under the conditions specified for your model year.
Do not immediately replace the socket if this terminal is dead. Earlier Silverado manuals document battery-feed circuits that may need an underhood fuse or connection before they become operational. (Chevrolet)
8. Test the Electric Brake Output
Connect a compatible trailer or follow the correct diagnostic procedure for your brake-controller system before judging Pin 6.
The Integrated Trailer Brake Control system can detect trailer-brake wiring faults, and its output should not be diagnosed as if it were a constant battery-feed circuit. (Chevrolet)
5 Common Silverado 7 Pin Problems to Check
A dead trailer circuit does not automatically mean the complete seven-pin socket needs replacement.
No 12 Volt Trailer Power
Start with the battery-feed circuit, related fuse or connection, and the truck’s year-specific trailering configuration.
On some older Silverados, GM installed the fuse provision while additional connection work could still be required. (Chevrolet)
No Electric Trailer Brake Output
Check the trailer connection, brake-controller status, Pin 6 wiring, connector corrosion, and applicable fuse circuits.
A brake-controller fault is different from a basic lighting failure. If the truck shows a warning, our Service Trailer Brake System diagnostic guide covers the next checks.
Trailer Lights Work Intermittently
Inspect both halves of the connector for loose blade tension, moisture, damaged terminals, and corrosion.
Late-model trucks can also detect trailer-light connection problems through the Trailering App when equipped. Chevrolet’s 2025 system can flag failed connector pins in its Lights status view. (GM Answers)
One Turn Signal Does Not Work
Test the affected Silverado terminal before opening the trailer harness.
If the truck-side pin flashes correctly, move your testing to the trailer plug, cable, lamp, and trailer ground. If the truck-side pin is dead, investigate the Silverado circuit first.
Check Trailer Wiring Message Appears
On the 2019 Silverado Integrated Trailer Brake Control system, GM provides a useful isolation procedure.
Disconnect the trailer, turn the ignition off, wait 10 seconds, and switch the ignition back to RUN. If CHECK TRAILER WIRING returns with the trailer disconnected, GM says the electrical fault is on the truck side. If it returns only after reconnecting the trailer, the fault is on the trailer side. (Chevrolet)
Which Silverado 7 Pin Wiring Diagram Should You Use
Use the Silverado 7 pin trailer wiring diagram for your exact generation, then identify each connection by circuit function before relying on color.
For 2007 to 2013 trucks, the familiar Yellow, Dark Green, Brown, White, Light Green, Red, and Dark Blue pattern is well documented. From 2014 onward, GM moved to multi-color wires, and the left-right stop-turn assignments need particular attention.
The 2019 model year deserves the most caution because Silverado LD and new-body Silverado trucks use different battery, ground, and right stop-turn colors.
For any replacement socket, test all seven functions before making permanent crimps or soldered connections.
Silverado 7 Pin Trailer Wiring FAQ
Are All Silverado 7 Pin Trailer Plugs Wired the Same
The seven basic trailer functions are standardized on modern Silverado factory connectors, but the factory harness colors are not the same across every year. Always match the connector terminal to its function and verify the wire before splicing.
What Color Is the Silverado Trailer Brake Wire
Chevrolet commonly identifies the electric trailer-brake circuit as Dark Blue or Blue, depending on model year. Older 2007 to 2013 documentation uses Dark Blue, while newer Silverado manuals commonly list Blue. (Chevrolet)
Which Silverado 7 Pin Is the 12 Volt Power Pin
Pin 4 is the Battery Feed terminal in Chevrolet’s truck-side seven-way connector diagram. Whether that circuit is active can depend on the truck’s year and electrical configuration.
Why Does My Silverado 7 Pin Have No 12 Volt Power
A dead auxiliary pin can result from a fuse, underhood connection, damaged wiring, connector corrosion, or a configuration-specific power condition. Older GM manuals specifically document battery-feed circuits that may require underhood setup, so test upstream before replacing the rear socket. (Chevrolet)
Is the 2019 Silverado LD Trailer Wiring Different
Yes. The 2019 Silverado LD manual lists Green/Brown for right stop-turn, Red/Violet for battery feed, and Black for ground. The redesigned 2019 Silverado uses Green/Violet, Red/Green, and White for those same circuits. (Car Manuals Online)
Where Is the Silverado Fifth Wheel 7 Pin Connector
On factory fifth-wheel or gooseneck-equipped trucks, Chevrolet places the additional trailer harness connector inside the pickup bed behind the rear wheel. This location is documented on both 2019 and 2023 Silverado configurations. (Chevrolet)
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