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Trailer Light Wiring Diagram: 4–7 Pin Pinouts and Troubleshooting

14 September 2026

Top-Selling Products

All Star Truck Parts 2Pcs 17LED Amber/Red Watermelon Lights Side Marker Turn Signal Lights with Steel Stainess Bezel Replacement for Kenworth Peterbilt Freightliner TrucksAll Star Truck Parts 2Pcs 17LED Amber/Red Watermelon Lights Side Marker Turn Signal Lights with Steel Stainess Bezel Replacement for Kenworth Peterbilt Freightliner Trucks
All Star Truck Parts 2Pcs 17LED Amber/Red Watermelon Lights Side Marker Turn Signal Lights with Steel Stainess Bezel Replacement for Kenworth Peterbilt Freightliner Trucks 2X AMBER
Super Bright: Built-in 17LEDs with special diamond-shaped 'jewel style' lens design, emits super bright light, makes your vehicle much more eye-catching. Low Profile height at only 1.6". Easy Installation: Hardwired with 4 wires, black is ground, blue wire is mid/low brightness serves as side...
$ 29.95
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All Star Truck Parts 2Pcs Glass Watermelon Lights Clear Lens Amber LED Side Marker Turn Signal Fender Bumper Air Cleaner Under Glow Lights + Bezel Replacement for Kenworth Peterbilt Freightliner TruckAll Star Truck Parts 2Pcs Glass Watermelon Lights Clear Lens Amber LED Side Marker Turn Signal Fender Bumper Air Cleaner Under Glow Lights + Bezel Replacement for Kenworth Peterbilt Freightliner Truck
All Star Truck Parts 2Pcs Glass Watermelon Lights Clear Lens Amber LED Side Marker Turn Signal Fender Bumper Air Cleaner Under Glow Lights + Bezel Replacement for Kenworth Peterbilt Freightliner Truck 2X AMBER/CLEAR LENS
[Super Bright] The glass watermelon lights built-in high-powered 15 LED bulb emits super bright starburst patterns light, makes your trucks much more eye-catching [Easy Installation] Lights are self grounded so negative/ground terminal can be connected directly to metal bezel or screw post, green wire...
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All Star Truck Parts 1.5 inch Mini Amber/Red Clear/Coloured Glass Lens Watermelon Lights LED Marker Clearance Light Turn Signal for Semi Truck Trailer, Compatible with Freightliner Kenworth PeterbiltAll Star Truck Parts 1.5 inch Mini Amber/Red Clear/Coloured Glass Lens Watermelon Lights LED Marker Clearance Light Turn Signal for Semi Truck Trailer, Compatible with Freightliner Kenworth Peterbilt
All Star Truck Parts 1.5 inch Mini Amber/Red Clear/Coloured Glass Lens Watermelon Lights LED Marker Clearance Light Turn Signal for Semi Truck Trailer, Compatible with Freightliner Kenworth Peterbilt 10x Red Clear Lens
Super Bright: The small watermelon lights built-in high-power LED emits super bright starburst pattern light,and traditional curved glass lens design makes the light sharper, making your vehicle much more eye-catching Well Made: Pure glass lens ensures the LED light provides optimal brightness and visibility,...
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Lighting Products

2pc Red/Amber 48 LED Round Double Face Chrome Stud Mount Pedestal Fender Stop Turn Tail Light Truck Trailer Peterbilt Freightliner Kenworth Mack Western Star 10-30V

2pc Red/Amber 48 LED Round Double Face Chrome Stud Mount Pedestal Fender Stop Turn Tail Light Truck Trailer Peterbilt Freightliner Kenworth Mack Western Star 10-30V

$ 34.50
2.5-inch round 13-LED red, amber or white clearance marker light with reflector lens — image 1 of 46

2.5" Round 13-LED Clearance Marker Light Kit

$ 12.95
5PCS 17 LED Amber Torpedo Cab Marker Roof Running Top Lights Assembly Super Bright Chrome Heavy Duty Trucks Replacement for International Kenworth/Peterbilt/Freightliner/Mack?

5PCS 17 LED Amber Torpedo Cab Marker Roof Running Top Lights Assembly Super Bright Chrome Heavy Duty Trucks Replacement for International Kenworth/Peterbilt/Freightliner/Mack?

$ 39.95
Amber Cab Marker Lights 12 LED Top Roof Running Rectangle Cab Lights LED Reflectors Compatible with Freightliner Century/Columbia Roof Cab Marker Clearance Lights Sealed Waterproof 12V (Amber/Clear Lens)

Amber Cab Marker Lights 12 LED Top Roof Running Rectangle Cab Lights LED Reflectors Compatible with Freightliner Century/Columbia Roof Cab Marker Clearance Lights Sealed Waterproof 12V (Amber/Clear Lens)

$ 37.95
19 LED Red Amber White CLEAR LENS Integrated Trailer Tail Lights Bar 12V Turn Signal Running Lamp for Trailer UTV UTE RV ATV Box Truck Left and Right (2 Pack)

19 LED Red Amber White CLEAR LENS Integrated Trailer Tail Lights Bar 12V Turn Signal Running Lamp for Trailer UTV UTE RV ATV Box Truck Left and Right (2 Pack)

$ 16.95
19 LED Red Amber White Integrated Trailer Tail Lights Bar 12V Turn Signal Running Lamp for Trailer UTV UTE RV ATV Box Truck Left and Right (2 Pack)

19 LED Red Amber White Integrated Trailer Tail Lights Bar 12V Turn Signal Running Lamp for Trailer UTV UTE RV ATV Box Truck Left and Right (2 Pack)

$ 19.95
2" Amber/Red Round Trailer 7 LED Clearance Marker Lights DOT FMVSS 108 SAE P2 Reflector Lens Grommet Flush-Mount Waterproof IP67 Marker Clearance Lights for Trailer Truck

2" Amber/Red Round Trailer 7 LED Clearance Marker Lights DOT FMVSS 108 SAE P2 Reflector Lens Grommet Flush-Mount Waterproof IP67 Marker Clearance Lights for Trailer Truck

$ 13.95
2Pcs LED Truck Trailer Tail Lights Bar Kit 40 LED Waterproof Tail Turn Signal Brake Light Running Reverse Light with Iron Net Protection 5 Wires 10V-30V for Truck Boat Trailer UTV RV Camper

2Pcs LED Truck Trailer Tail Lights Bar Kit 40 LED Waterproof Tail Turn Signal Brake Light Running Reverse Light with Iron Net Protection 5 Wires 10V-30V for Truck Boat Trailer UTV RV Camper

$ 32.95
Amber/Red 6.5" Led Marker Light Trucks Oval 16 LED Side Marker Turn Signal Clearance Lights Chrome Bezel Surface Mount Replacement Peterbilt Kenworth Freightliner Trailer 12V

Amber/Red 6.5" Led Marker Light Trucks Oval 16 LED Side Marker Turn Signal Clearance Lights Chrome Bezel Surface Mount Replacement Peterbilt Kenworth Freightliner Trailer 12V

$ 24.50
2pc Amber/Red 51 LED Clear Lens Double Face Stud Mount Pedestal Fender Stop Turn Tail Light Heavy Truck Trailer Peterbilt Freightliner Kenworth Mack Western Star Left & Right Side

2pc Amber/Red 51 LED Clear Lens Double Face Stud Mount Pedestal Fender Stop Turn Tail Light Heavy Truck Trailer Peterbilt Freightliner Kenworth Mack Western Star Left & Right Side

$ 38.95
3/4" (.75") Mini Round Clearance 3 LED Chrome Ring Front Rear Indicator Bullet Side Marker Light 304 Stainless Steel Base Truck RV Car Bus Trailer Pickup Van Caravan Boat Sealed Waterproof

3/4" (.75") Mini Round Clearance 3 LED Chrome Ring Front Rear Indicator Bullet Side Marker Light 304 Stainless Steel Base Truck RV Car Bus Trailer Pickup Van Caravan Boat Sealed Waterproof

$ 17.95
Truck Cab Lights 5PCS Amber Top Roof Running LED Marker Lights Waterproof 17 LED w/Chrome Base Compatible with Peterbilt/Kenworth/Freightliner/Western Star/Mack Trailer 12V

Truck Cab Lights 5PCS Amber Top Roof Running LED Marker Lights Waterproof 17 LED w/Chrome Base Compatible with Peterbilt/Kenworth/Freightliner/Western Star/Mack Trailer 12V

$ 79.95

Reflective Products

Conspicuity Tape DOT-C2 Approved Reflective Truck Trailer Red White

Conspicuity Tape DOT-C2 Approved Reflective Truck Trailer Red White

$ 8.95
white DOT-C2 high-intensity reflective tape roll in available widths and lengths — image 1 of 10

White DOT-C2 Reflective Tape – Commercial Roll

$ 12.95
New 2" x150' roll DOT-C2 Ultra Reflective Safety 6" Red/ 6" White Conspicuity Tape Truck Trailer Horse Diamond Pattern Long Lasting Waterproof Material, Super Strong Adhesive!

New 2" x150' roll DOT-C2 Ultra Reflective Safety 6" Red/ 6" White Conspicuity Tape Truck Trailer Horse Diamond Pattern Long Lasting Waterproof Material, Super Strong Adhesive!

$ 33.55
DOT Reflective Tape - DOT-C2 Conspiciuity Tape - COMMERCIAL ROLL - 2" inch x 150' FEET - Automobile Car Truck Boat Trailer Semi Truck Bus RED/WHITE/YELLOW/FLOURESCENT YELLOW GREEN

DOT Reflective Tape - DOT-C2 Conspiciuity Tape - COMMERCIAL ROLL - 2" inch x 150' FEET - Automobile Car Truck Boat Trailer Semi Truck Bus RED/WHITE/YELLOW/FLOURESCENT YELLOW GREEN

$ 32.50
10pcs of 2"x12" Strips Conspicuity Safety Caution Warning Tape DOT-C2 Approved Reflective Truck Trailer Red/White Adhesive Sticker

10pcs of 2"x12" Strips Conspicuity Safety Caution Warning Tape DOT-C2 Approved Reflective Truck Trailer Red/White Adhesive Sticker

$ 9.95
DOT-C2 Reflective Tape, Yellow/Orange Safety Warning Hazard Caution Conspiciuity Tape For School Bus Truck Trailer Boat Semi Motorcycle Bike and Helmet Waterproof

DOT-C2 Reflective Tape, Yellow/Orange Safety Warning Hazard Caution Conspiciuity Tape For School Bus Truck Trailer Boat Semi Motorcycle Bike and Helmet Waterproof

$ 12.95
20-pack of 2-by-12-inch red and white DOT-C2 reflective tape strips — image 1 of 8

DOT-C2 Red/White Reflective Tape Strips – 20 Pack

$ 15.95
Red/White Diagonal Warning Reflective Tape DOT-C2 Conspiciuity Tape - Commercial ROLL - 2" inch x 150' FEET - Automobile Car Truck Boat Trailer Semi Construction Safety Industrial

Red/White Diagonal Warning Reflective Tape DOT-C2 Conspiciuity Tape - Commercial ROLL - 2" inch x 150' FEET - Automobile Car Truck Boat Trailer Semi Construction Safety Industrial

$ 32.50
3" Inch Round DOT-SAE Amber/Red/White High Visibility Reflective Stick-On Prism Reflector | Strong Adhesive/Weatherproof | Trailer Camper RV Flatbed Fender Property Boat Marine

3" Inch Round DOT-SAE Amber/Red/White High Visibility Reflective Stick-On Prism Reflector | Strong Adhesive/Weatherproof | Trailer Camper RV Flatbed Fender Property Boat Marine

$ 12.40
Oval Reflectors Red/Amber Self Adhesive Or Drill Mount Quick Mount SAE 13 DOT

Oval Reflectors Red/Amber Self Adhesive Or Drill Mount Quick Mount SAE 13 DOT

$ 10.95
SOLAS Grade Marine Reflective Tape Conspicuity Safety Warning Silvery White Waterproof Ultra Reflective Glass Bead Honeycomb Technology Boats Rafts, Life Jacket, Motorcycles, Trailers

SOLAS Grade Marine Reflective Tape Conspicuity Safety Warning Silvery White Waterproof Ultra Reflective Glass Bead Honeycomb Technology Boats Rafts, Life Jacket, Motorcycles, Trailers

$ 23.95
Conspicuity Tape Premium DOT-C2 Approved Reflective Truck Trailer Red White 2x150, 4 Year Average Life -1 Roll

Conspicuity Tape Premium DOT-C2 Approved Reflective Truck Trailer Red White 2x150, 4 Year Average Life -1 Roll

$ 39.95

Wiring

14 AWG 7-way 100-percent copper trailer wire in available roll lengths — image 1 of 7

14 AWG 7-Way 100% Copper Trailer Wire

$ 33.35
14 AWG 7-way color-coded CCA trailer wire with 30% copper content — image 1 of 12

14 AWG 7-Way CCA Trailer Wire – 25, 50 or 100 ft

$ 37.95
Heavy Duty 14/12/10AWG Multi Guage 7 Way CCA Conductor Wire RV Trailer Tow Campers Cable Cord Insulated Stranded Copper Clad Aluminum Conductor Color Coded DOT SAE Approved 14/4 10/2 12/1

Heavy Duty 14/12/10AWG Multi Guage 7 Way CCA Conductor Wire RV Trailer Tow Campers Cable Cord Insulated Stranded Copper Clad Aluminum Conductor Color Coded DOT SAE Approved 14/4 10/2 12/1

$ 63.65
14 AWG 4-way color-coded CCA trailer wire with 30% copper content — image 1 of 5

14 AWG 4-Way CCA Trailer Wire – 25, 50 or 100 ft

$ 34.50
5 Way Trailer Wire Heavy Duty 14 AWG/Gauge CCA 5 Conductor Wire RV Trailer Tow Campers Cable Cord Insulated Stranded Copper Clad Aluminum Conductor Flexible Color-Coded DOT SAE Approved 25/50/100 FT

5 Way Trailer Wire Heavy Duty 14 AWG/Gauge CCA 5 Conductor Wire RV Trailer Tow Campers Cable Cord Insulated Stranded Copper Clad Aluminum Conductor Flexible Color-Coded DOT SAE Approved 25/50/100 FT

$ 32.50
6 Way Trailer Wire Heavy Duty 14 AWG/Gauge CCA 6 Conductor Wire RV Trailer Tow Campers Cable Cord Insulated Stranded Copper Clad Aluminum Conductor Flexible Color-Coded DOT SAE Approved 25/50/100 FT

6 Way Trailer Wire Heavy Duty 14 AWG/Gauge CCA 6 Conductor Wire RV Trailer Tow Campers Cable Cord Insulated Stranded Copper Clad Aluminum Conductor Flexible Color-Coded DOT SAE Approved 25/50/100 FT

$ 38.50
14 AWG 4-way 100-percent copper trailer wire in available roll lengths — image 1 of 12

14 AWG 4-Way 100% Copper Trailer Wire

$ 39.95
Trailer Wiring Harness Kit 4-Way Wishbone Style, Y Style 18AWG Pure Copper Core Color Coded Wire with Standard 4-pin Flat Plug Connector, 4' Female and 25' Male for 12V Trailer Boat Marine

Trailer Wiring Harness Kit 4-Way Wishbone Style, Y Style 18AWG Pure Copper Core Color Coded Wire with Standard 4-pin Flat Plug Connector, 4' Female and 25' Male for 12V Trailer Boat Marine

$ 11.95