To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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Easily add a 4-way trailer connector with this custom-fit harness. The T-connector plugs into existing wiring - no cutting needed. Powered converter protects vehicle circuits and ensures consistent trailer lighting for safe towing in any conditions.
The vehicle's wiring harness is often behind a trim panel or under the cargo floor. Some vehicles may require removing interior panels or lifting carpeted sections to reach it, but once accessed, the harness installs easily with quick-splice connectors.
Plugging in a trailer shouldn't mean tearing into your vehicle's wiring. This custom-fit T-connector snaps directly into your factory wiring harness, so you can get your trailer lights up and running without any cutting or splicing. Just plug it in, and you're ready to tow.
A well-lit trailer is a safe trailer. This 4-way wiring harness keeps your trailer's brake lights, turn signals, and running lights powered and in sync with your vehicle. Whether you're hauling a boat to the lake or a camper to the mountains, your lights stay bright and visible.
Some vehicles can't handle the extra electrical load of trailer lights. The built-in powered converter draws power directly from your battery, ensuring a steady, protected current to your trailer while keeping your vehicle's circuits from overloading.
Towing means exposing your wiring to dirt, rain, and road grime. This harness features fully insulated wires and a sealed converter, helping to prevent shorts and corrosion. It's built to withstand the elements so you can tow with confidence in any weather.
No extra trips to the hardware store - this kit comes with everything you need. With fuses, zip ties, and connectors included, you can complete the installation without hunting down extra parts.
California residents: click here
Quality product, well made and looks durable. The instructions were good. Connectors to the tail lights were plug and play. My install took approximately 5 hours, with breaks, because I had to remove several panels to route the wires. I took extra time to make a clean install. The most difficult was the power from the battery to the converter because the easiest route was to remove the belly pan. I soldered all connections instead of using crimp connectors. Your time will be determined by the configuration of your vehicle and how OCD you are.
Directions are terrible. Please send stsp by step instructions.
Tough running that one wire the length of the car ut the instructions were great and it installed easily,
Everything went well
Pain to run the wires but easy install otherwise and works great.
Fast delivery
Does not fit. This is mislabeled as custom bit is is a generic harness
Lazer S.
2/17/2026
Sorry to hear that. Can I ask why it isn't fitting? This is a custom fit part for your 2025 Santa Cruz and should be a direct fit behind the taillights. I can definitely say this will not fit just any vehicle and is not a generic wiring harness.
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
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Mike L.
3/19/2026
Hi Gary. The only instructions I have to offer would be a .pdf which is the same as what you received with the wiring harness. What specifically were you having trouble with?