Trailer Hitch Wiring & Electrical
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- Hopkins Towing®4-Wire Flat Connector with SplicesUniversal 4-Wire Flat Connector with Splices by Hopkins Towing®. To have a greater peace of mind when driving with a trailer, go with this perfect accessory that is sure to provide you with a safe, secure connection. Made of sturdy,...Multi-Tow™ provides multiple towing options from one connectorPlug-In Simple Wiring Kit$2.98 - $6.45
- Hopkins Towing®4-Wire Flat Extension AdapterUniversal 4-Wire Flat Extension Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail light,...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$9.68 - $14.68
- Hopkins Towing®4-Wire Flat MountUniversal 4-Wire Flat Mount by Hopkins Towing®. When attaching a trailer to your vehicle, a premium quality wiring kit or harness is a vital necessity. An automotive trailer must have a reliable connection with the signaling system of...Splice onto tow vehicle's wiring systemCorrosion resistant terminals$7.18 - $9.50
- Hopkins Towing®4-Wire Flat Y-Harness ConnectorUniversal 4-Wire Flat Y-Harness Connector by Hopkins Towing®. To have a greater peace of mind when driving with a trailer, go with this perfect accessory that is sure to provide you with a safe, secure connection. Made of sturdy,...Wiring kit for maintaining or re-wiring your trailerWishbone design - allows 2 brown wires to be run to each taillight$17.40 - $18.86
- Hopkins Towing®4-Wire Flat to 6-Pole Round AdapterUniversal 4-Wire Flat to 6-Pole Round Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail light,...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$28.29 - $30.63
- Hopkins Towing®5-Pole Round ConnectorUniversal 5-Pole Round Connector by Hopkins Towing®. To have a greater peace of mind when driving with a trailer, go with this perfect accessory that is sure to provide you with a safe, secure connection. Made of sturdy,...Corrosion Resistant TerminalsDie-cast zinc connectors for durability$7.23 - $8.05
- Hopkins Towing®5-Wire Flat ConnectorUniversal 5-Wire Flat Connector by Hopkins Towing®. To have a greater peace of mind when driving with a trailer, go with this perfect accessory that is sure to provide you with a safe, secure connection. Made of sturdy,...Multi-Tow™ provides multiple towing options from one connectorPlug-In Simple Wiring Kit$9.41 - $17.06
- Hopkins Towing®6-Pole Round Adapter with Flexible WiresUniversal 6-Pole Round Adapter with Flexible Wires by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$11.94 - $15.17
- Hopkins Towing®6-Pole Round ConnectorUniversal 6-Pole Round Connector by Hopkins Towing®. To have a greater peace of mind when driving with a trailer, go with this perfect accessory that is sure to provide you with a safe, secure connection. Made of sturdy,...Multi-Tow™ provides multiple towing options from one connectorPlug-In Simple Wiring Kit$4.07 - $16.12
- Hopkins Towing®6-Pole Round to 4-Wire Flat AdapterUniversal 6-Pole Round to 4-Wire Flat Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail light,...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$5.41 - $10.98
- Hopkins Towing®7 RV Blade ConnectorUniversal 7 RV Blade Connector by Hopkins Towing®. To have a greater peace of mind when driving with a trailer, go with this perfect accessory that is sure to provide you with a safe, secure connection. Made of sturdy,...Multi-Tow™ provides multiple towing options from one connectorPlug-In Simple Wiring Kit$7.96 - $14.07
- Hopkins Towing®7-Pole Round ConnectorUniversal 7-Pole Round Connector by Hopkins Towing®. To have a greater peace of mind when driving with a trailer, go with this perfect accessory that is sure to provide you with a safe, secure connection. Made of sturdy,...Multi-Tow™ provides multiple towing options from one connectorPlug-In Simple Wiring Kit$15.16 - $18.91
- Hopkins Towing®7-Way RV Blade To 4-Wire Flat AdapterUniversal 7-Way RV Blade To 4-Wire Flat Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail light,...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$10.00 - $11.94
- Hopkins Towing®7-Way RV Blade To 6-Wire Round AdapterUniversal 7-Way RV Blade To 6-Wire Round Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail light,...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$14.35 - $18.26
- Hopkins Towing®Endurance™ Flex AdapterUniversal Endurance™ Flex Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail light, auxiliary,...Provides for flexible reach3-Year Warranty$17.48 - $28.82
- Hopkins Towing®LED Test 7 Blade to 6 Round Adapter with LED'sUniversal LED Test 7 Blade to 6 Round Adapter with LED's by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn,...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$14.12 - $14.86
- Hopkins Towing®Multi-Tow™ 4-Wire Flat AdapterUniversal Multi-Tow™ 4-Wire Flat Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right turn, tail light,...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$24.61 - $37.55
- Hopkins Towing®Multi-Tow™ 7 RV Blade to 5-Wire and 4-Wire Flat AdapterUniversal Multi-Tow™ 7 RV Blade to 5-Wire and 4-Wire Flat Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$19.99 - $22.79
- Hopkins Towing®Multi-Tow™ 7 RV Blade to 6 Round and 4 Flat AdapterUniversal Multi-Tow™ 7 RV Blade to 6 Round and 4 Flat Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as left/right...Durable construction to last a long timeHeavily insulated wires with jacketed sleeving$16.00 - $24.49
- Hopkins Towing®Quick-Lock DiodeUniversal Quick-Lock Diode by Hopkins Towing®. Diode kit allows towed vehicle's taillight system to function properly. When attaching a trailer to your vehicle, a premium quality wiring kit or harness is a vital necessity. An automotive...Saves time over traditional diode blocksNo more crimping or stripping wire$10.49 - $36.27
- Hopkins Towing®Tail Light ConverterUniversal Tail Light Converter by Hopkins Towing®. Package. When attaching a trailer to your vehicle, a premium quality wiring kit or harness is a vital necessity. An automotive trailer must have a reliable connection with the signaling...Splice onto tow vehicle's wiring systemCorrosion resistant terminals$17.13 - $32.15
- Hopkins Towing®TesterUniversal Tester by Hopkins Towing®. When attaching a trailer to your vehicle, a premium quality wiring kit or harness is a vital necessity. An automotive trailer must have a reliable connection with the signaling system of your car to...Splice onto tow vehicle's wiring systemCorrosion resistant terminals$4.46 - $8.43
- Hopkins Towing®Tow Doctor™ Wire Harness Test UnitUniversal Tow Doctor™ Wire Harness Test Unit by Hopkins Towing®. When attaching a trailer to your vehicle, a premium quality wiring kit or harness is a vital necessity. An automotive trailer must have a reliable connection with the...Splice onto tow vehicle's wiring systemCorrosion resistant terminals$295.94 - $493.45
- AP Products®Plug-Guard™ Total Plug ProtectionPlug-Guard™ Total Plug Protection by AP Products®. Clean, efficient and secure protection from the elements for the male plug of your trailer's wiring harness, while the trailer is not in use. Plug Guards attach to the hitch frame or...Made from rock-solid strong materials to withstand the rigors of the roadBacked by solid design, exceptional reliability, and maximum safety$16.74 - $16.97
- Pollak®7-Way PlugUniversal 7-Way Plug by Pollak®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...Expertly crafted from premium materialsDesigned to match rigorous quality standards$6.56 - $34.77
- Pollak®Heavy Duty 7-Way PlugUniversal Heavy Duty 7-Way Plug by Pollak®. 7-way die cast plug with cable guard. Will accept a large range of wire gauges. Interchangeable. This top-grade product is expertly made in compliance with stringent industry standards to...Expertly crafted from premium materialsDesigned to match rigorous quality standards$14.19 - $23.65
- CURT®2-Way Flat Connector Plug and SocketUniversal 2-Way Flat Connector Plug and Socket by CURT®. Length: 12". Includes trailer-end plug and vehicle-end socket on 12" bonded wire loop. Like trailer hitches and ball mounts, electrical connectors range all over the board in...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$2.92 - $4.54
- CURT®4-Way Flat Connector PlugUniversal 4-Way Flat Connector Plug by CURT®. Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer's electrical functions are, you need a...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$2.90 - $17.88
- CURT®4-Way Flat Connector Plug and SocketUniversal 4-Way Flat Connector Plug and Socket by CURT®. Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer's electrical functions are, you...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$4.64 - $12.65
- CURT®4-Way Flat Connector SocketUniversal 4-Way Flat Connector Socket by CURT®. Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer's electrical functions are, you need a...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$6.41 - $9.99
So, you’ve got your trailer connected to your truck with the right hitch, ball mount and trailer ball. You’re ready to go, but what about your trailer lights? If the trailer connector doesn’t match the one on your tow vehicle, or if the vehicle doesn’t even have a plug, stick around. From basic exterior lights to 12-volt powered accessories, all trailers need electric power supplied by your vehicle, and we have everything needed to make a hassle-free connection including extensions, connectors, harnesses and adapters.
There are a number of standardized trailer connectors, such as 4-pin flat/round, 5-pin flat, 6-pin square/round, and 7-pin round. The simplest 4-pin system is used for small trailers, and has one ground pin, one pin each for left and right turn signals and brake lights, and one for the running lights. 5-pin flat connectors add a wire for the back-up lights. If the trailer is equipped with surge brakes, this circuit also disengages the brakes when the vehicle is backing up.
In addition to connections for turn signals, brake lights, tail lights and ground, 6-pin connectors have one terminal each for electric brakes and 12-volt accessories. 6-pin connectors come in square and round styles and are common to gooseneck and 5th wheel trailers, boat trailers and campers. 7-pin connectors are most commonly found on new vehicles that are prewired for towing. Along with the same functions as a 6-pin connector, this connector has a 7th circuit that is for the back-up lights. 7-pin connectors come with round or RV blade-style pins. Fortunately, no matter what connector you have on your trailer, we have the wiring harnesses that will let you plug into your vehicle’s electrical system.
The first thing you have to determine is whether your vehicle has a factory installed trailer towing package. If it does, you’ll find an electrical connector at the rear of the vehicle, usually on or near the bumper. If the shape and number of pins (wires) on the vehicle connector matches the one on your trailer, then all you’ll need is a wiring harness of sufficient length with the same connector at each end. If not, we can supply you with a plug-and-play adapter harness that will make all your trailer electrical functions work, without any cutting and splicing. For example, if your truck has a 7-pin round connector but your trailer has a 4-pin flat connector, one of our adapter harnesses will have you connected in minutes.
But don’t worry if your vehicle isn’t already set up for towing, we can still get you connected without much hassle. For most vehicles we offer a plug-and-play T-shaped harness (so called because it connects to both of your tail lights) that connects your vehicle lights to the trailer lights. If you have an obscure vehicle for which no T-shaped harness is available, we can still help, but some splicing will be necessary. And if your vehicle uses separate bulbs for the brake lights and turn signals but your trailer uses one bulb for both, we can supply you with a converter harness that will make the connection simple. We also have a large assortment of brackets, connectors, sockets, and anything else you need to get connected.
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Trailer Hitches
Hitch Balls & Mounts
Brake Controllers
Pintle Hitches
Hitch Accessories
5th Wheel Hitches
Gooseneck Hitches
Weight Distribution
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Front Hitches
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Trailer Couplers
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