Tow wiring harnesses connect your tow vehicle's electrical system to a trailer plug, providing the signals that power your trailer's lights and brakes. Vehicle-specific harnesses plug into your tow vehicle's existing wiring using factory connectors, eliminating the need to splice or tap wires. Universal harnesses work on any vehicle but require more installation effort. A properly installed harness ensures reliable trailer lighting without damaging your vehicle's electrical system.

What to Know Before You Buy

• Vehicle-specific harnesses offer the easiest installation—no cutting, splicing, or test light work required.
• Verify your vehicle year, make, model, and whether it has a factory tow package that may already include a harness.
• Universal harnesses require more wiring knowledge but work when vehicle-specific options aren't available.
• Some newer vehicles need additional modules (converter boxes) to translate LED signals for trailer bulbs.

Installing a trailer wiring harness for the first time? Tell us your vehicle and we'll recommend the best harness option.

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