Trailer Wiring and Electrical

Trailer Wiring Adapters
Need to convert a 7-way trailer connector to a 4-flat or a 4-Way Flat to a 5-Way Flat connector, we have what you need. Our trailer wiring and electrical adapters allow for convenient connection to multiple trailers.
Trailer Connectors, Trailer Plug Wiring
Get your trailer ready for the road with trailer connectors and wiring harnesses from TruckSpring.com. We offer components for both Trailer-end and Car-end connections, that meet SAE specification J1128 assuring consistent quality and reliability.
Mounting Brackets
Do you have a trailer connector hanging that needs to be mounted correctly. We stock mounting brackets for 4, 5, 6, and 7 way trailer connectors. Trailer electrical mounting brackets allow for quick installation of electrical wiring plugs.
Power Converters
A trailer light power module eliminates additional electrical draw on the vehicles taillight circuits which ensures you have maximum trailer light brightness and protects you from overloading the system.
Tail Light Converters
Taillight Converters adapt import and domestic vehicles with separate turn and stop lights (3 wire system) to standard trailer taillight wiring (2 wire systems).
T-Connectors
Need to install trailer wiring on your car, truck SUV or van? Tow Ready T-One Connectors eliminate the need to cut or splice wires when installing trailer lights. Simple do-it-yourself installation of trailer wiring.
Testers and Test Equipment
Are you having a problem with your trailer lights and unable to find the problem? Use an inexpensive electrical tester and save time and money. Perfect for testing brake lights and turn signals, or easily locate short circuits in trailer wiring.
Wiring Components
Need to replace or install new wiring for your trailer or vehicle? Bulk wire, wire conduit and junction boxes can make the job easier and protect your trailer wiring from the elements.
Trailer Wiring Information
Not sure which wires attach to what on your trailer connectors? Does one of your turn signals not work and you’re not sure which wire to inspect? Check out or trailer wiring diagrams for a quick reference on trailer wiring.

If you're going to tow a trailer, you will need your trailer lights running before you go. We stock and complete line of trailer connectors and adapters for quick, professional trailer repairs.

Need to tow a trailer and your car, truck or SUV doesn't have trailer wiring? Today T-Connectors take the guess work out of trailer wiring. No need to splice, tape or cut wires. T-Connectors are vehicle specific and install quick and easy. Simply locate your wiring harness connector, unplug the connection and insert the T-Connector into the vehicle harness.

Popular Trailer Wiring and Electrical Products

Part #: 422417 Conduit - Split Loom - 1/2 Inch - 422417
1/2 Inch Split Loom Conduit.
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$0.26
List Price
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$0.18
Part #: 422416 Conduit - Split Loom - 3/8 Inch - 422416
3/8 Inch Split Loom Conduit.
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$0.21
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$0.35
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$0.14
Part #: 422415 Conduit - Split Loom - 1/4 Inch - 422415
1/4 Inch Split Loom Conduit.
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$0.16
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$0.10
Part #: 118710 7-Way European Style Round Pin to 4-Flat Adapter - 118710
Tow Ready trailer wiring adapter converts 7-Way European Style Round Pin to 4-Flat Adapter.
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$19.90
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$21.96
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$2.06
Part #: 119130 Taillight Converter - 119130
Tow Ready Taillight Converter adapts import and domestic vehicles with separate turn and stop lights (3-wire system) to standard trailer taillight wiring (2-wire system). Works with either LED or incandescent bulbs.
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$19.34
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$28.57
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$9.23
Part #: 118104 4-Flat Trailer End Connector to 6 Pole Square Adapter for Jayco Type Trailers - 118104
Tow Ready 4-Flat Trailer End Connector to 6 Pole Square Adapter is desiged to adapt 6 pole Jayco type trailers to 4-way. Cable is 31 inches long.
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$28.95
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$38.52
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$9.57
Part #: 787195 7-Way Trailer to to 5-Way Flat Car End Coiled Jumper - 787195
Wesbar 7-Way Trailer to 5-Way Flat Car End Coilded Jumper with 4 foot cable.
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$20.34
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$7.16
Part #: 20212 7-Way Mountng Bracket for U.S. Car Connectors - 20212
Tow Ready Mounting Bracket for 7-Way U.S. Car Connectors. Includes 2 self-tapping screws, bolts and nuts.
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$4.72
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$1.25
Part #: 118159 6 and 7-Way Connector Mounting Box - Universal - 118159
Tow Ready 6 and 7-Way Connector Mounting Box has a universal fit for both Round and Square Tube Hitches.
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Part #: 118519 T-One Connector with Upgraded Circuit Protected ModuLite HD Module - 118519
T-One connector 118519 requires no splicing of wires. Simply locate your vehicles wiring harness connector, unplug the connection and insert the T-Connector into the vehicle's harness. No special tools required.
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