Trailer Wiring, Plugs & Sockets at Trailer Parts Superstore
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Trailer Wiring, Plugs & Sockets

Trailer Wiring, Plugs & Sockets

Trailer wiring and harness plugs are available in a variety of sizes and configurations. The most basic of designs is the color coded 4-WIRE system which 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. The "Flat-4" harness plug is found on almost all boat trailers and many smaller utility trailers that do not have brakes.
5-WIRE systems provide all the color coded functions of the 4-pole systems plus an additional blue wire which may be used for Hydraulic disc brakes or auxiliary lights.
6-WIRE systems provide all the color-coded functions of the 4-pole systems plus two additional poles for 12-volt feed (red wire) and suppl (blue wire) to Electric brake systems.
7-WIRE systems provide all the color-coded functions of the 6-pole systems plus an additional pole for interior/exterior lighting. 7-wire systems are most commonly found on RV & Cargo trailers.
Tail Light Converters are necessary for adapting import and domestic vehicles with separate turn and stop lights (3-wire system) to standard trailer tail light wiring (2-wire system). Always consult the vehicle owner's manual when considering trailer wiring.

Click here to see a 4-pole system color coded trailer wiring diagram

Quantity Description Price

OPTRONICS Marker Light Inline 2-Pole Plug #A45CB

OPTRONICS Marker Light Inline 2-Pole Plug #A45CB

Stock# 1294245
OPTRONICS A-45PB Inline 2-way molded plug for use with marker / clearance lights. Includes 6" red/white wire lead.

$2.29

OPTRONICS Tail Light 3-Pole Plug to Weather Tight Plug #AL45PWTB

OPTRONICS Tail Light 3-Pole Plug to Weather Tight Plug #AL45PWTB

Stock# 1294223
OPTRONICS AL45PWTB 3-way molded plug to a weather tight plug.  Weather tight plug is also refereed to a Fit n' Forget plug.

$3.49

Truck-Lite Tail Light Female 3 Prong Plug #96107

Truck-Lite Tail Light Female 3 Prong Plug #96107

Stock# 1569246
Truck-Lite 'New' style 3 prong female plug works with the 'New' 3-Prong Male plugs found on newer Stop/Tail/Turn Truck-Lite lights.

$2.99

100' Spool 4-Way 16/18 Gauge Bonded Trailer Wire #49955

100' Spool 4-Way 16/18 Gauge Bonded Trailer Wire #49955

Stock# 5177122
100' spool of color coded (Green / Yellow / Brown / White) 4-Way 16/18 gauge bonded trailer wire.

$41.50

4-Wire x 25' Split Trailer Harness Kit #V5425Y

4-Wire x 25' Split Trailer Harness Kit #V5425Y

Stock# 5005198
25' split four conductor harness & flat 4-pole trunk connector.

$16.99

5-Wire x 25' Split Trailer Harness Kit #V5525Y

5-Wire x 25' Split Trailer Harness Kit #V5525Y

Stock# 5005031
25' split five-conductor harness & flat 5-pole trunk connector.

$20.88

Flat 4-Prong Trailer Connector Plug  #V5400A

Flat 4-Prong Trailer Connector Plug #V5400A

Stock# 5005089
Replacement flat 4-pole trailer plug with 12" color-coded lead wires.

$4.49

Flat 4-Prong Trunk Connector Plug  #V5400B

Flat 4-Prong Trunk Connector Plug #V5400B

Stock# 5005090
Tow Vehicle flat 4-pole trunk connector with 12" color-coded lead wires.

$5.79

Endurance™ 4 Flat Trailer Plug #48110

Endurance™ 4 Flat Trailer Plug #48110

Stock# 5177132
Endurance™ 4 Flat Trailer plug is a heavy duty upgrade to any standard 4 Flat trailer plug.

$5.99

Endurance™ 4 Flat Trunk Connector #48030

Endurance™ 4 Flat Trunk Connector #48030

Stock# 5177135
Endurance 4 Flat Vehicle Connector is a heavy duty upgrade to any standard 4 Flat vehicle side connector.

$6.99

Flat 4-Prong 48" Wiring Extension #47115

Flat 4-Prong 48" Wiring Extension #47115

Stock# 5177024
Extends wiring system 48" for more flexibility in electrical hook-up.

$8.39

18" 4-Flat Plug Extension w/ Wire Taps #118185

18" 4-Flat Plug Extension w/ Wire Taps #118185

Stock# 5223292
Extends wiring system 18" for more flexibility in electrical hook-up. Kits includes 4 wire taps.

$6.50

4-Flat Connector Trailer End Plug & 4' Cable # 787264

4-Flat Connector Trailer End Plug & 4' Cable # 787264

Stock# 5223340
Commonly found on trailers with just lights and no other electrical components. The 4-Flat plug comes pre-wired with a 4-strand color-coded jacketed trailer wire harness 4' long.

$10.95

4-Flat Connector Trailer End Plug & 8' Cable # 787268

4-Flat Connector Trailer End Plug & 8' Cable # 787268

Stock# 5223341
Commonly found on trailers with just lights and no other electrical components. The 4-Flat plug comes pre-wired with a 4-strand color-coded jacketed trailer wire harness 8' long.

$15.95

Flat 4-Prong Tail Light Converter #V5410

Flat 4-Prong Tail Light Converter #V5410

Stock# 5005005
For use when tow vehicle has a separate turn signal & brake bulb.

$16.99

Round 4-Pole Truck & Trailer Connector Set #5404

Round 4-Pole Truck & Trailer Connector Set #5404

Stock# 5005023
Heavy-duty connectors provide more durability than molded vinyl plugs.

$11.95

Flat 5-Plug Trailer Connector Plug #V5500A

Flat 5-Plug Trailer Connector Plug #V5500A

Stock# 5005027
5-prong used for Hydraulic disc brakes or auxiliary lighting applications.

$6.79

5-Flat Connector Cover #20118

5-Flat Connector Cover #20118

Stock# 5223291
Black rubber cover keeps 5-Flat connectors clean and protected when not in use.

$2.49

Flat 5-Plug Trunk Connector Plug #V5500B

Flat 5-Plug Trunk Connector Plug #V5500B

Stock# 5005028
5-prong used for Hydraulic disc brakes or auxiliary lighting applications.

$7.79

Flat 5-Prong 18" Wiring Extension #TC51000

Flat 5-Prong 18" Wiring Extension #TC51000

Stock# 5023232
Extends wiring system 18" for more flexibility in electrical hook-up.

$11.50

Square 6-Plug Trunk Connector Set  #47995

Square 6-Plug Trunk Connector Set #47995

Stock# 5177061
6-prong connector set used for brakes or auxiliary lighting applications.

$5.77

Round 6-Pole Trailer End Connector  #48445

Round 6-Pole Trailer End Connector #48445

Stock# 5177030
Provides additional circuits for electric brakes or auxiliary power lead.

$6.29

Round 6-Pole Trailer End Electric Plug & 6' Cable

Round 6-Pole Trailer End Electric Plug & 6' Cable

Stock# 5177087
Provides additional circuits for electric brakes or auxiliary power lead. 6-pole plug comes pre-wired with 6-strand color-coded trailer wire.

$25.75

Round 6-Pole Vehicle End Plastic Socket #48425

Round 6-Pole Vehicle End Plastic Socket #48425

Stock# 5177013
Socket provides necessary circuits for electric brake systems or auxiliary lights.

$6.29

Round 6-Pole Vehicle End Metal Socket #18036

Round 6-Pole Vehicle End Metal Socket #18036

Stock# 5223230
Socket provides necessary circuits for electric brake systems or auxiliary lights.

$12.99

Endurance™ 7-Pole RV Blade Trailer End Plug #48510

Endurance™ 7-Pole RV Blade Trailer End Plug #48510

Stock# 5177133
Endurance™ 7-Pole RV Blade Trailer End Plug is a heavy duty upgrade to any factory trailer plug end plug. Comes with mounting bracket for trailer.

$11.77

7-Pole RV Blade Trailer End Plug #48505

7-Pole RV Blade Trailer End Plug #48505

Stock# 5177029
Commonly found on larger trailers with brakes and auxiliary lighting.

$8.39

7-Pole RV Blade Trailer End Plug & 3' Cable

7-Pole RV Blade Trailer End Plug & 3' Cable

Stock# 5177089
Commonly found on larger trailers with brakes and auxiliary lighting.
7-pole plug comes pre-wired with 7-strand color-coded trailer wire.

$20.95

7-Pole RV Blade Trailer End Plug & 6' Cable

7-Pole RV Blade Trailer End Plug & 6' Cable

Stock# 5177090
Commonly found on larger trailers with brakes and auxiliary lighting.
7-pole plug comes pre-wired with 7-strand color-coded trailer wire.

$29.99

7-Pole RV Blade Trailer End Plug & 11' Cable

7-Pole RV Blade Trailer End Plug & 11' Cable

Stock# 5177091
Commonly found on larger trailers with brakes and auxiliary lighting.
7-pole plug comes pre-wired with 7-strand color-coded trailer wire.

$37.50

Endurance 7-Pole RV Blade Vehicle End Socket #48480

Endurance 7-Pole RV Blade Vehicle End Socket #48480

Stock# 5177131
Endurance 7-Pole RV Blade Vehicle End Socket is a heavy duty upgrade to any factory end plug.

$12.49

Endurance™ 7-Pole Twist Mount RV Blade Vehicle End Socket #40930

Endurance™ 7-Pole Twist Mount RV Blade Vehicle End Socket #40930

Stock# 5177136
Endurance 7-Pole Twist Mount RV Blade Vehicle End Socket is a heavy duty direct replacement for certain Chevy/GM factory end plugs.

$10.95

7-Pole RV Blade Vehicle End Socket #48485

7-Pole RV Blade Vehicle End Socket #48485

Stock# 5177007
Commonly found on larger trailers with brakes and auxiliary lighting.

$9.44

7-Pole Vehicle to 7-Pole Trailer Extension Cable - 7' #118664

7-Pole Vehicle to 7-Pole Trailer Extension Cable - 7' #118664

Stock# 5223024
7-Pole vehicle end to 7-pole trailer end extension cable allows for easy hook-up of 5th wheel and gooseneck trailers - 7'

$48.95

Hoppy Fifth Wheel or Gooseneck Wiring Harness, #41157

Hoppy Fifth Wheel or Gooseneck Wiring Harness, #41157

Stock# 5177130
Hoppy 5th Wheel/Gooseneck wiring harness is 8' long.
Compatible With: 2000-2012 Chevy, GMC, Ford, Dodge, Nissan, and Toyota with factory wiring harness (7 RV Blade Bumper Connector).

$63.79

Fifth Wheel or Gooseneck Wiring Harness, #5197410

Fifth Wheel or Gooseneck Wiring Harness, #5197410

Stock# 5223284
BARGMAN 90° Fifth Wheel or Gooseneck wiring harnesses with 9 ft length and 7-way connector. Fits Chevy, GMC and Ford

$79.50

Fifth Wheel or Gooseneck Wiring Harness, #5197411

Fifth Wheel or Gooseneck Wiring Harness, #5197411

Stock# 5223285
BARGMAN 90° Fifth Wheel or Gooseneck wiring harnesses with 9 ft length and 7-way connector. Fits full size Dodge pick-ups.
SUPPLIES LIMITED

Regular Price: $69.95

Special Price: $49.99


4-Way Flat Connector Mounting Bracket #18144

4-Way Flat Connector Mounting Bracket #18144

Stock# 5223194
"L-Bracket" designed to securely hold flat-4 trunk connector under vehicle.

$6.59

4, 5 & 6-Way Trunk Connector Bracket #18137

4, 5 & 6-Way Trunk Connector Bracket #18137

Stock# 5223192
"L-Bracket" designed to hold 4, 5 & 6-way round trunk connectors.

$8.99

7-Way Round Trunk Connector Mounting Bracket #118138

7-Way Round Trunk Connector Mounting Bracket #118138

Stock# 5223193
"L-Bracket" designed to securely hold 7-way round trunk connectors.

$8.99

4-Flat Connector Storage Box #18145

4-Flat Connector Storage Box #18145

Stock# 5223016
Neatly stores 4-flat connector, easily installs with cable ties or screws.

$9.50

4-Flat Connector Cover with LED Tester #118147

4-Flat Connector Cover with LED Tester #118147

Stock# 5223322
4-Flat Connector Cover with LED Tester is black rubber and keeps 4-Flat connectors clean and protected when not in use. Will fit on vehicle side only.

$2.95

6 & 7-Way Connector Mounting Box #18156

6 & 7-Way Connector Mounting Box #18156

Stock# 5223203
Box mounts to hitches with 2-1/2" square cross tubes to hold sockets.

$12.99

6 & 7-Way Connector Mounting Box #18159

6 & 7-Way Connector Mounting Box #18159

Stock# 5223246
Universal fit box mounts to hitches with round & square cross tubes to hold sockets.

$12.99

4, 5, & 6-Pole Trunk Connector Bracket #48605

4, 5, & 6-Pole Trunk Connector Bracket #48605

Stock# 5177067
Heavy-duty "L-Bracket" mounts underneath vehicle to hold sockets.

$5.25

Marker Light 2-Pole Plug  #142-49

Marker Light 2-Pole Plug #142-49

Stock# 5005131
Peterson mfg. 2-way molded plug for use 142, 143, 146, 150 series marker lights.

$2.45

Marker Light 2-pole Harness Female Plug #153-49

Marker Light 2-pole Harness Female Plug #153-49

Stock# 5005055
Peterson right angle mfg. 2-way molded female plug for use with Peterson marker light series 152, 153, and 154.

$2.69

Tail Light 3-pole Harness Plug, Right Angle #421-491

Tail Light 3-pole Harness Plug, Right Angle #421-491

Stock# 5005224
Peterson right angle mfg. 3-way molded plug for use with sealed incandescent tail lights.

$2.39

Tail Light 3-pole Harness Plug #431-491

Tail Light 3-pole Harness Plug #431-491

Stock# 5005139
Peterson mfg. 3-way molded plug for use with #421 series flush mount tail lights.

$3.19

OPTRONICS Marker Light Inline 2-Pole Plug

OPTRONICS Marker Light Inline 2-Pole Plug

Stock# 1294151
OPTRONICS A-46PB Inline 2-way molded plug for use with marker / clearance lights. Includes 6" black/white wire lead.

$3.50

OPTRONICS Marker Light Offset 2-Pole Plug

OPTRONICS Marker Light Offset 2-Pole Plug

Stock# 1294152
OPTRONICS A-49PB Offset 2-way molded plug for use with marker / clearance lights. Includes 6" red/white wire lead.

$3.99

OPTRONICS Tail Light Straight 3-Pole Plug

OPTRONICS Tail Light Straight 3-Pole Plug

Stock# 1294153
OPTRONICS A-45PB Straight 3-way molded plug for use with tail lights. Includes 10" red/black/white wire lead.

$3.50

OPTRONICS Tail Light Right-Angle 3-Pole Plug

OPTRONICS Tail Light Right-Angle 3-Pole Plug

Stock# 1294154
OPTRONICS A-47PB Right-Angle 3-way molded plug for use with tail lights. Includes 10" red/black/white wire lead.

$3.99

OPTRONICS Marker Light 1-Pole Plug, A65P

OPTRONICS Marker Light 1-Pole Plug, A65P

Stock# 1294155
OPTRONICS A65P Inline 1-pole molded plug for use with marker / clearance lights. Includes 6" black wire lead.

$3.89

TRUCK-LITE Marker Light 2-Pole Plug #94902

TRUCK-LITE Marker Light 2-Pole Plug #94902

Stock# 1569016
TRUCK-LITE # 94902 2-way molded plug for use with marker / clearance lights. Includes 6" black/white wire lead.

$2.49

TRUCK-LITE Fit 'N Forget Rear Sidemarker Plug

TRUCK-LITE Fit 'N Forget Rear Sidemarker Plug

Stock# 1569176
Rear sidemarker plug w/LLV Packard connectors keeps water, salt and corrosives from LED lamps.
SUPPLIES LIMITED

$3.69

TRUCK-LITE Fit 'N Forget CHMSL Plug #95033

TRUCK-LITE Fit 'N Forget CHMSL Plug #95033

Stock# 1569175
CHMSL plug w/LLV Packard connectors keeps water, salt and corrosives from LED lamps.
SUPPLIES LIMITED

$3.69

TRUCK-LITE 8" Fit 'N Forget Stop/Turn/Tail Plug #94707

TRUCK-LITE 8" Fit 'N Forget Stop/Turn/Tail Plug #94707

Stock# 1569172
TRUCK-LITE # 94707 LED Fit 'N Forget stop/turn/tail plug keeps water salt and corrosives from LED lamps. Features 8 inch 16 gauge GPT wire.

$3.99

TRUCK-LITE 4" LED Fit 'N Forget M/C Adapter Plug #93745

TRUCK-LITE 4" LED Fit 'N Forget M/C Adapter Plug #93745

Stock# 1569179
TRUCK-LITE # 93745 LED Fit 'N Forget marker/clearance adapter plug is used to adapt LED lamps to conventional plug harness systems. Features 4" 16 gauge GPT wire.

$5.40

TRUCK-LITE 6" Right Angle Marker Plug #94964

TRUCK-LITE 6" Right Angle Marker Plug #94964

Stock# 1569180
TRUCK-LITE # 94964 right angle marker/clearance plug is designed for use in limited space areas. Features 6" 16 gauge GPT wire.

$3.75

50' ABS Green Lectraflex 7 Conductor Wire #3-326

50' ABS Green Lectraflex 7 Conductor Wire #3-326

Stock# 1566188
Phillips 7 conductor 50' spool - 1/8, 2/10, 4/12 Ga. ABS Bright Green
Black - Brown - Blue - Green - Red - White - Yellow

$158.50

100' ABS Green Lectraflex 7 Conductor Wire #3-327

100' ABS Green Lectraflex 7 Conductor Wire #3-327

Stock# 1566189
Phillips 7 conductor 100' spool - 1/8, 2/10, 4/12 Ga. ABS Bright Green
Black - Brown - Blue - Green - Red - White - Yellow

$299.00

50' Black Duraflex 7 Conductor Wire #3-241

50' Black Duraflex 7 Conductor Wire #3-241

Stock# 1566190
Phillips 7 conductor 50' spool - 1/12, 6/14 Ga. black jacket Duraflex wire
Black - Brown - Blue - Green - Red - White - Yellow

$68.75

100' Black Duraflex 7 Conductor Wire #3-242

100' Black Duraflex 7 Conductor Wire #3-242

Stock# 1566191
Phillips 7 conductor 100' spool - 1/12, 6/14 Ga. black jacket Duraflex wire

$132.50

50' Black Duraflex 6 Conductor Wire #3-201

50' Black Duraflex 6 Conductor Wire #3-201

Stock# 1566192
Phillips 6 conductor 50' spool - 6/14 Ga. black jacket Duraflex wire
Black - Brown - Green - Red - White - Yellow

$63.75

100' Black Duraflex 6 Conductor Wire #3-202

100' Black Duraflex 6 Conductor Wire #3-202

Stock# 1566193
Phillips 6 conductor 100' spool - 6/14 Ga. black jacket Duraflex wire
Black - Brown - Green - Red - White - Yellow

$113.75

50' Black Duraflex 4 Conductor Wire #3-191

50' Black Duraflex 4 Conductor Wire #3-191

Stock# 1566194
Phillips 4 conductor 50' spool - 4/14 Ga. black jacket Duraflex wire
Brown - Green - White - Yellow

$41.50

100' Spool 12 Ga. Primary Wire

100' Spool 12 Ga. Primary Wire

Phillips 12 gauge Primary wire.  100' spool available with black or red jacket.

$29.50

100' Spool 10-2 AWG Primary Wire #2-404

100' Spool 10-2 AWG Primary Wire #2-404

Stock# 1566285
Phillips 10-2 AWG Primary wire. 100' spool of black/white wire with gray jacket.

$133.00

100' Spool 14-4 AWG Primary Wire #2-425

100' Spool 14-4 AWG Primary Wire #2-425

Stock# 1566289
Phillips 14-4 AWG Primary wire. 100' spool of brown/yellow/green/white wire.

$123.50

100' Spool 16-2 AWG Primary Wire #2-401

100' Spool 16-2 AWG Primary Wire #2-401

Stock# 1566282
Phillips 16-2 AWG Primary wire. 100' spool of black/white wire with gray jacket.

$35.99

100' Spool 16-3 AWG Primary Wire #2-422

100' Spool 16-3 AWG Primary Wire #2-422

Stock# 1566286
Phillips 16-3 AWG Primary wire. 100' spool of brown/yellow/green wire.

$59.95

100' Spool 12-3 AWG Primary Wire #2-426

100' Spool 12-3 AWG Primary Wire #2-426

Stock# 1566290
Phillips 12-3 AWG Primary wire. 100' spool of brown/yellow/green wire.

$129.00

100' Spool 16 Ga. Primary Wire

100' Spool 16 Ga. Primary Wire

Phillips 16 gauge Primary wire.  100' spool available with black, blue or red jacket.

$14.50

100' Spool 14-2 AWG Primary Wire #2-402

100' Spool 14-2 AWG Primary Wire #2-402

Stock# 1566283
Phillips 14-2 AWG Primary wire. 100' spool of black/white wire with gray jacket.

$54.00

100' Spool 16-4 AWG Primary Wire #2-423

100' Spool 16-4 AWG Primary Wire #2-423

Stock# 1566287
Phillips 16-4 AWG Primary wire. 100' spool of brown/yellow/green/white wire.

$123.00

100' Black Duraflex 4 Conductor Wire #3-192

100' Black Duraflex 4 Conductor Wire #3-192

Stock# 1566195
Phillips 4 conductor 100' spool - 4/14 Ga. black jacket Duraflex wire
Brown - Green - White - Yellow

$85.00

100' Spool 14 Ga. Primary Wire

100' Spool 14 Ga. Primary Wire

Phillips 14 gauge Primary wire.  100' spool available with black, blue, brown, green, red, white or yellow jacket.

$17.99

100' Spool 12-2 AWG Primary Wire #2-403

100' Spool 12-2 AWG Primary Wire #2-403

Stock# 1566284
Phillips 12-2 AWG Primary wire. 100' spool of black/white wire with gray jacket.

$75.00

100' Spool 14-3 AWG Primary Wire #2-424

100' Spool 14-3 AWG Primary Wire #2-424

Stock# 1566288
Phillips 14-3 AWG Primary wire. 100' spool of brown/yellow/green wire.

$72.50

LUBRIMATIC Dielectric Waterproof Connector Grease #11755

LUBRIMATIC Dielectric Waterproof Connector Grease #11755

Stock# 5135035
Dielectric grease protects electrical connections and wiring from moisture, salt, dirt and corrosion. 2 oz. tube

$5.99

Deluxe Connector Cleaner #11000

Deluxe Connector Cleaner #11000

Stock# 1623429
Deluxe Connector Cleaner is a must have tool for anyone with a trailer or RV.  This brush has high carbon steel bristles that are rust resistant and will successfully clean any connector.

$9.95

Nylon Cable Ties 7" (12-Pack) #L-7MHB

Nylon Cable Ties 7" (12-Pack) #L-7MHB

Stock# 5006020
7" Black Nylon Cable Ties can be used to help secure brake lines, wiring, and many other things on a trailer.
Sold in packs of 12.

$3.69

Nylon Cable Ties 14" (5-Pack) #L-14MHB

Nylon Cable Ties 14" (5-Pack) #L-14MHB

Stock# 5006022
14" Black Nylon Cable Ties can be used to help secure brake lines, wiring, and many other things on a trailer.
Sold in packs of 5.

$3.89