Trailer Hitch Wiring & Electrical
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- Hopkins Towing®7 Blade, 7 Round, and 6 Round Mounting Bracket (48625)Universal 7 Blade, 7 Round, and 6 Round Mounting Bracket 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...Slotted bracket for easy prewired harness installationBlack powder coat finish resists corrosion$6.53
- Hopkins Towing®7 RV Blade and 6-Pole Mounting Bracket (48615)Universal 7 RV Blade and 6-Pole Mounting Bracket by Hopkins Towing®. Quantity per Package: 1. When attaching a trailer to your vehicle, a premium quality wiring kit or harness is a vital necessity. An automotive trailer must have a...Works with all 7 Blade vehicle end socketsEndurance™ 6 Round vehicle end sockets$5.58
- Hopkins Towing®7 RV Blade to 5-Wire Flat Connector (47375)Universal 7 RV Blade to 5-Wire Flat Connector 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,...Plug-In Simple!® AdapterDie-cast zinc for durability$13.38
- Hopkins Towing®7-Pole Round to 4-Wire Flat Connector (47405)Universal 7-Pole Round to 4-Wire Flat Connector 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,...Plug-In Simple!® AdapterEasy grip design$9.18
- Hopkins Towing®7-Pole Round to 6-Pole Round Adapter (47445)Universal 7-Pole Round 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,...Plug-In Simple!® AdapterCenter pin is set up for auxiliary power$23.91
- Hopkins Towing®7-Pole Round to 7 RV Blade Adapter with Flexible Wires (47425)Universal 7-Pole Round to 7 RV Blade 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...Plug-In Simple!® AdapterProtective convoluted wire tubing protects wires$30.92
- Hopkins Towing®7-Way RV Blade To 6-Wire Adapter with Flexible Wires (47435)Universal 7-Way RV Blade To 6-Wire Adapter with Flexible Wires by Hopkins Towing®. Standart with Flexible Wires. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides...Plug-In Simple!® AdapterFlexible Wire Provides Larger Turning Radius$17.39
- Hopkins Towing®7-Way RV Blade to 4-Wire Flat Adapter (47355)Universal 7-Way RV Blade to 4-Wire Flat Adapter (47355) 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...Plug-In Simple!® AdapterPatented Weatherproof Design$10.00
- Hopkins Towing®7-Way RV Blade to 4-Wire Flat Adapter with Built-In LED Tester (47345)Universal 7-Way RV Blade to 4-Wire Flat Adapter with Built-In LED Tester (47345) by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions...Plug-In Simple!® AdapterIncludes Function Testing LEDs$11.28
- Hopkins Towing®7-Way RV Blade to 4-Wire Flat Adapter with Flexible Wires (47365)Universal 7-Way RV Blade to 4-Wire Flat Adapter with Flexible Wires (47365) by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as...Plug-In Simple!® AdapterFlexible Wire Provides Larger Turning Radius$11.94
- Hopkins Towing®7-Way RV Blade to 6-Wire Round Adapter (47555)Universal 7-Way RV Blade to 6-Wire Round Adapter (47555) by Hopkins Towing®. With Electric Brake Center Pin. Electric Brake Center Pin. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this...Plug-In Simple!® AdapterCenter pin is set up for electric brake$14.35
- Hopkins Towing®7-Way RV Blade to 6-Wire Round Adapter (47545)Universal 7-Way RV Blade to 6-Wire Round Adapter (47545) by Hopkins Towing®. With Auxiliary Center Pin. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such...Plug-In Simple!® AdapterCenter pin is set up for auxiliary power$18.26
- Hopkins Towing®72" LED Compatible Tail Light Converter (48895)Universal 72" LED Compatible Tail Light Converter (48895) 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...Electronic Taillight Converter adapts tow vehicles taillight system to the trailer'sPowers up to 2.1 amps per output$32.15
- Hopkins Towing®74" Tail Light Converter with 4-Wire Flat Extension (48925)Universal 74" Tail Light Converter with 4-Wire Flat Extension (48925) 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...Electronic Taillight Converter adapts tow vehicles taillight system to the trailer'sPowers up to 2.1 amps per output$24.01
- Hopkins Towing®Black Multi-Tow™ 7 RV Blade to 6 Round and 4-Flat Adapter (47575)Universal Black Multi-Tow™ 7 RV Blade to 6 Round and 4-Flat Adapter (47575) by Hopkins Towing®. With Electric Brake Center Pin. Finish: Black. Specially designed for horse trailers or utility/cargo trailers fitted with electric...Multi-Tow® Adapter; provides multiple towing options from one connectorIncludes dust cover$22.87
- Hopkins Towing®Black Multi-Tow™ 7 RV Blade to 6 Round and 4-Flat Adapter (47565)Universal Black Multi-Tow™ 7 RV Blade to 6 Round and 4-Flat Adapter (47565) by Hopkins Towing®. With Auxiliary Center Pin. Finish: Black. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes,...Multi-Tow® Adapter; provides multiple towing options from one connectorIncludes dust cover$16.00
- Hopkins Towing®Car End Test Unit (50918)Universal Car End Test Unit (50918) 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...Designed so that one person can make sure a vehicle wiring harness has been installed properly and all functions are workingTests all tow vehicle functions: ground, auxiliary power, brake, direction, and backup$295.94
- Hopkins Towing®Endurance™ 7 RV Blade to 4-Wire Flat Flex Adapter (47340)Universal Endurance™ 7 RV Blade to 4-Wire Flat Flex Adapter (47340) by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as...Provides for flexible reach3-Year Warranty$28.82
- Hopkins Towing®Endurance™ 7 RV Blade to 5-Wire Flat Flex Adapter (47390)Universal Endurance™ 7 RV Blade to 5-Wire Flat Flex Adapter (47390) by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as...Provides for flexible reach3-Year Warranty$17.48
- Hopkins Towing®Endurance™ Multi-Tow® 7 RV Blade to 6 Round, 4 / 5-Wire Flat Adapter (47570)Universal Endurance™ Multi-Tow® 7 RV Blade to 6 Round, 4 / 5-Wire Flat Adapter by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such...Patented Quick-Change™ plug quickly accommodates both 6 pole wiring codesMulti-Tow® Adapter provides four different trailer towing options from a single device$25.93
- Hopkins Towing®LED Test 7 Blade to 6 Round Adapter with LED's (47525)Universal LED Test 7 Blade to 6 Round Adapter with LED's (47525) by Hopkins Towing®. With Auxiliary Center Pin. Auxiliary Center Pin. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this...Built-in troubleshootingLEDs test electrical functions$14.12
- Hopkins Towing®Multi-Tow™ 4-Wire Flat to 6 Round and 4-Wire Flat Adapter (47175)Universal Multi-Tow™ 4-Wire Flat to 6 Round and 4-Wire Flat Adapter (47175) by Hopkins Towing®. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable provides such functions as...Multi-Tow® provides multiple towing options from one connectorPrewired for easier installation$37.55
- Hopkins Towing®Multi-Tow™ 7 RV Blade to 5-Wire and 4-Wire Flat Adapter (47675)Universal Multi-Tow™ 7 RV Blade to 5-Wire and 4-Wire Flat Adapter (47675) by Hopkins Towing®. With 12V Power Socket. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable...Provides multiple towing options from one connectorTurns your 7 RV Blade connector into a 12-Volt power socket$19.99
- Hopkins Towing®Multi-Tow™ 7 RV Blade to 5-Wire and 4-Wire Flat Adapter (47385)Universal Multi-Tow™ 7 RV Blade to 5-Wire and 4-Wire Flat Adapter (47385) by Hopkins Towing®. Without 12V Power Socket. Specially designed for horse trailers or utility/cargo trailers fitted with electric brakes, this awesome cable...Plug-In Simple!® AdapterMulti-Tow® provides multiple towing options from one connector$22.79
- Hopkins Towing®Nite-Glow™ 7-Way RV Blade To 4-Wire Flat Adapter (47335)Universal Nite-Glow™ 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,...Plug-In Simple!® AdapterNite-Glow illuminates on Taillight Function Verifying Continuity$12.71
- Hopkins Towing®OE Vehicle Harness with Heavy Duty 7 Round Connector (40777)Universal OE Vehicle Harness with Heavy Duty 7 Round Connector by Hopkins Towing®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind,...Compatible with Ford, GM and other popular tow vehiclesPlug-In Simple for quick and easy installation or replacement$51.00
- Hopkins Towing®Quick-Fix™ 4-Wire Flat Connector Kit (48195)Universal Quick-Fix™ 4-Wire Flat Connector Kit 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...Replaces damaged 4-Wire FlatNo external splices for enhanced weatherproofing$7.76
- Hopkins Towing®Quick-Lock Diode (56305)Universal Quick-Lock Diode (56305) by Hopkins Towing®. Quantity per Package: 4. 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...Saves time over traditional diode blocksNo more crimping or stripping wire$36.27
- Hopkins Towing®Square Bubble Surface Level (8010095019)Square Bubble Surface Level by Hopkins Towing®. This multi-purpose tool provides level for surface, vertical or horizontal planes. Features a reflective bubble that can easily be seen from a distance. This Made in USA level is great for...Levels Horizontal Vertical And SurfaceEasy To See Reflective Bubble$2.55
- Hopkins Towing®Tail Light Diode Kit (48955)Universal Tail Light Diode Kit 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...Isolates Towed Vehicle from MotorhomeSplices Into Existing Harness$30.43
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
Sway Control
Front Hitches
Tow Bars
Trailer Couplers
Trailer Brakes
Trailer Breakaway Kit
Hitch Cargo Carriers
Hitch Covers
Hitch Steps
Straps & Tie Downs
Trailers
Trailer Jacks
Trailer Winches
Trailer Tool Boxes
Trailer Accessories
Tow Lights