Trailer Hitch Wiring & Electrical
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- CURT®5-Way Flat Connector Tester (57505)Universal 5-Way Flat Connector Tester by CURT®. 5-Way. Material: Plastic. Confirms the vehicle and trailer are properly wired. Part of towing responsibly is making sure your trailer lights are working properly. Whether you have just...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$9.48
- CURT®6' 7-Way Cold-Weather Replacement RV Blade Harness (56611)Universal 6' 7-Way Cold-Weather Replacement RV Blade Harness (56611) by CURT®. Package type: Bulk. Replaces a trailer-end 7-way RV blade plug. Soft casing remains flexible in cold temperatures. Length: 6 ft. Temperature Rating: -40F to...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$47.19
- CURT®6-Way Round Connector Plug with Spring (58082)Universal 6-Way Round Connector Plug with Spring (58082) by CURT®. Bulk. Material: Die-Cast. Includes trailer-end plug with wire protector spring. Whether you're a contractor on your way to the jobsite or just a casual fisherman heading...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$8.67
- CURT®6-Way Round Connector Tester (58650)Universal 6-Way Round Connector Tester by CURT®. 6-Way. Material: Plastic. Confirms the vehicle and trailer are properly wired. Part of towing responsibly is making sure your trailer lights are working properly. Whether you have just...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$11.33
- CURT®6-Way Round to 4-Way Flat Adapter (57620)Universal 6-Way Round to 4-Way Flat Adapter (57620) by CURT®. Bulk. Adapts 6-way round vehicle-end to 4-way flat trailer-end. Product: Electrical Adapter. Material: Plastic. There are several different types of connectors used to supply...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$7.03
- CURT®6-Way Round to 7-Way RV Blade Adapter (57667)Universal 6-Way Round to 7-Way RV Blade Adapter by CURT®. Adapts 6-way round vehicle-end to 7-way RV blade trailer-end. Packaged. There are several different types of connectors used to supply power from a tow vehicle's electrical...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$28.06
- CURT®7-Pole Round to 4-Way Flat Adapter (57041)Universal 7-Pole Round to 4-Way Flat Adapter (57041) by CURT®. Packaged. Adapts 7-way round vehicle-end to 4-way flat trailer-end. Product: Electrical Adapter. Material: Plastic. There are several different types of connectors used to...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$11.31
- CURT®7-Pole Round to 4-Way Flat Adapter (57040)Universal 7-Pole Round to 4-Way Flat Adapter (57040) by CURT®. Bulk. Adapts 7-way round vehicle-end to 4-way flat trailer-end. Product: Electrical Adapter. Material: Plastic. There are several different types of connectors used to...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$9.02
- CURT®7-Way Blade Vehicle End Electrical Adapter with Backup Alarm (57727)Universal 7-Way Blade Vehicle End Electrical Adapter with Backup Alarm (57727) by CURT®. Extends 7-way RV blade connector and adds a backup alarm. Packaged. Material: Plastic. Product: Electrical Adapter. There are several different...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$22.84
- CURT®7-Way Blade Vehicle End To 4-Way Flat Trailer End Electrical Adapter with Backup Alarm (57724)Universal 7-Way Blade Vehicle End To 4-Way Flat Trailer End Electrical Adapter with Backup Alarm (57724) by CURT®. With Package. Adapts 7-way RV blade vehicle-end to 4-way flat trailer-end. Includes backup alarm. Material: Plastic....Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$17.65
- CURT®7-Way Blade Vehicle End To 5-Way Flat Trailer End Electrical Adapter with Backup Alarm (57725)Universal 7-Way Blade Vehicle End To 5-Way Flat Trailer End Electrical Adapter with Backup Alarm (57725) by CURT®. Adapts 7-way RV blade vehicle-end to 5-way flat trailer-end. Includes backup alarm. Packaged. Material: Plastic. Product:...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$17.98
- CURT®7-Way Blade Vehicle End To 6-Way Round Trailer End Electrical Adapter with Backup Alarm (57726)Universal 7-Way Blade Vehicle End To 6-Way Round Trailer End Electrical Adapter with Backup Alarm (57726) by CURT®. With Center Pin For Auxiliary Power. Adapts 7-way RV blade vehicle-end to 6-way round trailer-end with center pin for...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$22.02
- CURT®7-Way RV Blade Connector Tester (58273)Universal 7-Way RV Blade Connector Tester (58273) by CURT®. Packaged. Material: Plastic. Color: Orange. Confirms the vehicle and trailer are properly wired. Product: LED Connector Tester. Material: Plastic. Part of towing responsibly is...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$15.44
- CURT®7-Way RV Blade Connector Tester (58272)Universal 7-Way RV Blade Connector Tester (58272) by CURT®. Bulk. Material: Plastic. Color: Orange. Confirms the vehicle and trailer are properly wired. Product: LED Connector Tester. Material: Plastic. Part of towing responsibly is...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$17.95
- CURT®7-Way RV Blade Connector Tester (58270)Universal 7-Way RV Blade Connector Tester (58270) by CURT®. Bulk. Material: Plastic. Color: Black. Confirms the vehicle and trailer are properly wired. Whether you're a contractor on your way to the jobsite or just a casual fisherman...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$13.94
- CURT®7-Way RV Blade Electrical Adapter with Tester (57245)Universal 7-Way RV Blade Electrical Adapter with Tester (57245) by CURT®. Adapts 7-way RV blade vehicle-end to 4-way flat trailer-end. Includes LED electrical tester. Packaged. Product: Electrical Adapter. Material: Plastic. There are...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$13.02
- CURT®7-Way Round RV Blade to 4-Way Electrical Adapter (57240)Universal 7-Way Round RV Blade to 4-Way Electrical Adapter (57240) by CURT®. Bulk. Adapts 7-way RV blade vehicle-end to 4-way flat trailer-end. Product: Electrical Adapter. Material: Plastic. There are several different types of...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$7.60
- CURT®7-Way Round RV Blade to 4-Way Electrical Adapter (57241)Universal 7-Way Round RV Blade to 4-Way Electrical Adapter (57241) by CURT®. Packaged. There are several different types of connectors used to supply power from a tow vehicle's electrical system to a trailer's wiring system. Some...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$10.41
- CURT®7-Way Round RV Blade to 5-Way Electrical Adapter (57250)Universal 7-Way Round RV Blade to 5-Way Electrical Adapter (57250) by CURT®. Bulk. Adapts 7-way RV blade vehicle-end to 5-way flat trailer-end. Product: Electrical Adapter. Material: Plastic. There are several different types of...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$11.25
- CURT®7-Way Round RV Blade to 6-Way Electrical Adapter (57660)Universal 7-Way Round RV Blade to 6-Way Electrical Adapter (57660) by CURT®. With Center Pin For Brake Lights. Bulk. Adapts 7-way RV blade vehicle-end to 6-way round trailer-end with center pin for brake lights. Product: Electrical...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$10.52
- CURT®8' 7-Way Cold-Weather Replacement RV Blade Harness (56612)Universal 8' 7-Way Cold-Weather Replacement RV Blade Harness (56612) by CURT®. Package type: Bulk. Replaces a trailer-end 7-way RV blade plug. Soft casing remains flexible in cold temperatures. Temperature Rating: -40F to 221F. The wind...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$58.84
- CURT®Bonded 4-Wire Spool (57001)Universal Bonded 4-Wire Spool by CURT®. Length: 25'. Includes 25' of standard color-coded trailer wire (green, yellow, brown and white). Whether you're a contractor on your way to the jobsite or just a casual fisherman heading to the...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$24.23
- CURT®Circuit Breaker (58351)Universal Circuit Breaker (58351) by CURT®. Power: 20 Amp. Whether you're a contractor on your way to the jobsite or just a casual fisherman heading to the boat landing, you need working trailer lights to tow safely and legally. For any...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$4.59
- CURT®Circuit Breaker (58371)Universal Circuit Breaker (58371) by CURT®. Power: 40 Amp. Whether you're a contractor on your way to the jobsite or just a casual fisherman heading to the boat landing, you need working trailer lights to tow safely and legally. For any...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$5.73
- CURT®Circuit Breaker (58361)Universal Circuit Breaker (58361) by CURT®. Power: 30 Amp. Whether you're a contractor on your way to the jobsite or just a casual fisherman heading to the boat landing, you need working trailer lights to tow safely and legally. For any...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$4.59
- CURT®Circuit Breaker (58341)Universal Circuit Breaker (58341) by CURT®. Power: 15 Amp. Whether you're a contractor on your way to the jobsite or just a casual fisherman heading to the boat landing, you need working trailer lights to tow safely and legally. For any...Splices into the vehicle’s wiring to provide a connection for a trailer plugProudly made in Wisconsin, from start to finish$4.59
- CURT®Non-powered 3-to-2-Wire Tail Light Converter (55179)Universal Non-powered 3-to-2-Wire Tail Light Converter (55179) by CURT®. 2.1 Amp Turn/Brake, 5 Amp Tail Light. Quantity per Package: 1. 10 Amp. With Splice Input and 38" Extender Kit. Converts 3-wire vehicle system to 2-wire trailer...Uses plug-and-play connectors and provides a standard trailer wiring outputTested in-house for safety$21.17
- CURT®Non-powered 3-to-2-Wire Tail Light Converter (55177)Universal Non-powered 3-to-2-Wire Tail Light Converter (55177) by CURT®. 2.1 Amp Turn/Brake, 5 Amp Tail Light. Quantity per Package: 1. 10 Amp. With Splice Input and Dust Cover. Converts 3-wire vehicle system to 2-wire trailer light...Uses plug-and-play connectors and provides a standard trailer wiring outputTested in-house for safety$18.90
- CURT®Non-powered 3-to-2-Wire Tail Light Converter (58240)Universal Non-powered 3-to-2-Wire Tail Light Converter (58240) by CURT®. 2.1 Amp Turn/Brake, 5 Amp Tail Light. Quantity per Package: 1. 10 Amp. With Splice Input/Output. Adapts 3-wire vehicle system to 2-wire trailer light wiring. When...Uses plug-and-play connectors and provides a standard trailer wiring outputTested in-house for safety$14.32
- CURT®Powered 3-to-2-Wire Tail Light Converter (59496)Universal Powered 3-to-2-Wire Tail Light Converter (59496) by CURT®. 3 Amp Turn/Brake, 6 Amp Tail Light. With Wiring Kit and Potted Enclosure. Quantity per Package: 1. One Year Limited. When your vehicle does not readily provide an...Uses plug-and-play connectors and provides a standard trailer wiring outputTested in-house for safety$57.44
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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