Blue Ox EZ Light Wiring Harness Kit Tail Light Wiring Harness BX88406Blue OxOriginal price was $699.99. Current price is $142.23.In Stock
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Easy Installation: The Blue Ox BX88275 is designed for quick and easy installation. You can connect your RV to your car's electrical system in just 15 minutes.
Installation Required Yes/No: Yes
Mounting Hardware Included Yes/No: Yes
Terminal Type: 4-Way Flat
488: Yes
2770: No
The Blue Ox BX88275 EZ Light Wiring Harness is the ultimate solution for connecting your RV's electrical system to a car being towed behind it. Forget about complex installations and time-consuming setups. This product is designed for efficiency and ease of use, allowing you to start your journey in as little as 15 minutes. The kit includes a 4-Way Flat terminal type, ensuring a secure and steady connection. This product comes with all necessary mounting hardware, making the installation process straightforward and hassle-free. Please note that installation is required for this product.
Blue Ox is known internationally for recreational and commercial towing products, manufacturing in Pender, Nebraska since 1925. The line covers tow bars and vehicle-specific baseplates for flat towing behind a motorhome, sway control and weight distributing hitches, supplemental braking accessories and towing wiring, backed by patented designs and long-standing customer service.
Blue Ox has manufactured since 1925 and is recognised internationally for towing products and customer service. The company operates from Pender, Nebraska, where it grew out of Automatic Manufacturing Co., a business that started with cattle oilers and developed into agricultural equipment, tractor accessories and trailer towing hardware. That agricultural engineering heritage still shows in how the towing products are built, and the company holds patents across weight distribution, fifth wheel and tow bar designs.
Flat towing is the discipline Blue Ox is best known for. Towing a car with all four wheels on the ground behind a motorhome demands a system that stays rigid under braking, articulates properly over uneven ground, and connects to the towed vehicle at points strong enough to take the load. Blue Ox tow bars handle the first two, with self-aligning arms that latch under tension and release without a struggle when the load is off them. Vehicle-specific baseplates handle the third, engineered per make and model to tie into structural mounting points behind the fascia.
The wider flat towing range covers supplemental braking systems, safety cables and the accessories that make a complete legal setup, along with baseplate wiring and dinghy towing harnesses that pass lighting signals to the towed vehicle without back-feeding its electrical system.
For conventional trailer towing, Blue Ox weight distributing hitches with integrated sway control transfer tongue load onto the tow vehicle's front axle and resist the yaw that crosswinds and passing trucks induce.
The company describes its foundation as customer service, designing around what owners actually ask for, and it runs an RV park adjacent to the factory where customers can stay. Sister operations at the same Nebraska site include Automatic grain roller mills and MAD-RAMPS pivoting ramp systems.
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The BX88275 is a universal wiring harness designed to integrate a vehicle's tail light and brake light circuits with a towing system. It includes a converter unit, T-connector harness with color-coded wires for driver and passenger sides, a 4-way flat connector for the towing vehicle, a 4-way bracket, scotch-lock connectors, and a grounding wire with ring terminal.
The BX88275 is described as a universal harness, meaning it is designed to work across multiple vehicle types. However, the manual does not specify which vehicles are excluded or which specific makes and models have been tested. Vehicles with trunks or hatches have an alternative routing option available. Contact Blue Ox at (402) 385-3051 to confirm compatibility with your specific vehicle.
You will need: wire cutters, a 3/32" drill bit, and the provided scotch-lock connectors, zip ties, ring terminal, and screw. The manual does not specify whether a power drill is required or whether hand tools are sufficient, or whether any other tools such as a screwdriver or pliers are needed.
The harness includes scotch-lock connectors (quantity not specified), zip ties, a ring terminal, a screw for the grounding connection, and dielectric grease. The manual does not specify the exact quantity of scotch-lock connectors or zip ties included.
Follow these steps in order: (1) Remove tail light housings from both sides; (2) Install converter on driver side; (3) Route T-connector with green wire to passenger side; (4) Cut tail light and brake light wires, leaving 2–3" on each side; (5) Connect wires on driver side using scotch-lock connectors (blue to tail light, red to brake light from harness; brown to tail light, yellow to brake light to assembly); (6) Connect wires on passenger side (purple to tail light, orange to brake light from harness; brown to tail light, green to brake light to assembly); (7) Secure loose wiring with zip ties; (8) Route 4-way flat harness to grille; (9) Reinstall tail light housings; (10) Attach 4-way bracket near grille; (11) Install 4-flat end into bracket; (12) Drill 3/32" hole and ground white wire; (13) Apply dielectric grease; (14) Test with engine running.
Cut the tail light and brake light wires on both the driver and passenger side of the vehicle, leaving at least 2–3" of wire on each side of the cuts. This allows enough length to connect the wires using scotch-lock connectors without excessive slack.
On the driver side, use scotch-lock connectors to connect: blue wire to the tail light wire from the vehicle harness, red wire to the brake light wire from the vehicle harness, brown wire to the tail light wire going to the tail light assembly, and yellow wire to the brake light wire going to the tail light assembly.
On the passenger side, use scotch-lock connectors to connect: purple wire to the tail light wire from the vehicle harness, orange wire to the brake light wire from the vehicle harness, brown wire to the tail light wire going to the tail light assembly, and green wire to the brake light wire going to the tail light assembly.
Route the T-connector end with the green wire to the passenger side and up through the opening on the passenger side. Be careful to avoid hot pipes, heat shields, the fuel tank, and any other points that may pinch or damage the wire. For vehicles with trunks or hatches, you may route the harness under the carpet or threshold instead of under the vehicle.
Install the converter on the driver side behind the driver side tail light.
Attach the 4-way bracket in a convenient location near the grille to make it easier to plug in the 4-flat extension. The manual does not specify the exact mounting method or fasteners required.
Use zip ties to secure loose wiring behind both tail light assemblies in secure spots (step 7). Route the 4-way flat harness to the vehicle's grille area, securing it as needed with zip ties (step 8). Secure the remainder of the T-connector harness in a secure area with zip ties after reinstalling the tail light housings (step 9).
Yes. You must drill a 3/32" hole to secure the white grounding wire with a ring terminal. Do not drill into any exposed surfaces or the vehicle floor or bed. Locate a suitable grounding point near the connector, clean dirt, paint and rust proofing material from the area, then drill and secure the wire with the provided screw.
Drill a 3/32" hole for the grounding wire with ring terminal.
Locate a suitable grounding point near the connector. Do not drill into any exposed surfaces or the vehicle floor or bed. Clean dirt, paint and rust proofing material from the area before drilling.
The white wire is the grounding wire. It must be secured to a suitable grounding point near the connector using the provided ring terminal and screw. The hole should be 3/32" in diameter, and the grounding area must be cleaned of dirt, paint and rust proofing material.
Apply a small amount of dielectric grease to the 4-way flat terminals to prevent corrosion.
When routing the T-connector harness to the passenger side, be careful to avoid hot pipes, heat shields, the fuel tank, and any other points that may pinch or damage the wire. Do not drill the grounding hole into any exposed surfaces or the vehicle floor or bed.
When removing the tail light housings, be careful not to break the alignment tabs or housing. Pull them away from the vehicle gently.
Test all functions with the engine running to ensure proper operation. The manual does not specify which functions to test or what proper operation looks like.
Yes. Vehicles with trunks or hatches may route the harness going to the passenger side under the carpet or threshold in place of routing under the vehicle.
The BX88275 is a universal harness designed for most vehicles. Confirm compatibility with your specific vehicle by contacting Blue Ox at (402) 385-3051.
Leave at least 2–3" of wire on each side of the cuts to allow enough length for scotch-lock connector installation.
Driver side: blue wire to tail light from harness, red wire to brake light from harness, brown wire to tail light assembly, yellow wire to brake light assembly.
Passenger side: purple wire to tail light from harness, orange wire to brake light from harness, brown wire to tail light assembly, green wire to brake light assembly.
Avoid hot pipes, heat shields, fuel tank, and any points that may pinch or damage the wire. Do not drill into exposed surfaces or the vehicle floor or bed.
Test all functions with the engine running to ensure proper operation.
Test all functions with the engine running to ensure proper operation (step 14). If lights do not work, verify that all scotch-lock connectors are properly seated and that the correct color wires are connected on both the driver and passenger sides. Check that the grounding wire is securely fastened to a clean grounding point. If problems persist, contact Blue Ox customer service at (402) 385-3051.
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