Chassis and Running Gear
Receiver Hitch and 7-Way Trailer Wiring Installation
Typical range
$500 to $2,500
Shop hours
2 to 10
Labor rate
$260/hr
The short answer
Tow hitch and wiring installation covers receiver hitch mounting, 7-way and 4-way connector wiring, brake controller integration, and charge line provisioning. Work runs $500 to $2,500, or 2 to 10 hours at $260 per hour plus parts, installed at Yorba Linda.
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What this work actually involves
A trailer wiring install is judged entirely by what it does two years later, and the difference is in the connections. A scotch-lock tap into a taillight harness works on the day it is installed and fails the first time the vehicle sees a wet winter, because the tap breaks the wire insulation and lets moisture wick along the copper. We solder and heat-shrink, or we use the vehicle-specific factory connector where one exists, and we run a properly fused feed from the battery for the charge line rather than borrowing it from an existing circuit.
The 7-way pin assignments matter because they carry three different jobs on one connector: lighting, trailer brake command, and battery charge. Getting the brake wire on a circuit that shares a ground with the lighting produces the classic complaint of trailer brakes that pulse with the turn signal. We run a dedicated ground back to the chassis, not to a body panel, because a body panel ground on a vehicle that lives near the coast will corrode and give you intermittent braking within a couple of years.
Receiver installation is straightforward on most chassis and less so on van and box body applications where the frame extension has already been modified or where a body builder added equipment behind the rear axle. We check what is already mounted on the frame rails before drilling, verify the hitch rating against what you actually intend to pull, and fabricate mounting where the bolt-on receiver does not fit the specific frame configuration.
Systems and brands we work on: Curt, B&W.
Location: All work is performed at our Yorba Linda facility. We do not offer mobile, roadside, or fleet route service.
02
What the job includes
- Receiver hitch installation on truck, van, and SUV chassis
- Custom mounting fabrication where a bolt-on receiver does not fit the frame
- 7-way and 4-way connector installation with soldered, sealed connections
- Vehicle-specific factory harness connector use where one is available
- Dedicated fused charge line run from the battery for trailer battery charging
- Brake controller mounting, wiring, and gain setup
- Dedicated chassis ground routing rather than body panel grounding
- Trailer light function verification across all circuits under load
- Connector mounting position and strain relief so the plug does not drag
- Hitch rating verification against the intended towed weight
03
When you need this service
- Trailer lights that work intermittently or dim when the brakes are applied
- Trailer brakes that pulse in time with a turn signal
- A corroded, green, or loose 7-way connector at the tow vehicle
- A trailer battery that never reaches full charge while towing
- A brake controller reading no trailer connected despite a good plug
- A tow vehicle with no receiver, or one rated below the trailer weight
- A previous install using insulation-piercing taps in the taillight harness
04
How we do it, step by step
- 01
Application and rating review
Trailer weight, tongue weight, and intended use compared against the vehicle tow rating and the hitch class, so we install what the job actually calls for.
- 02
Frame inspection before drilling
Rails checked for existing body builder equipment, prior modifications, and corrosion, particularly on van and box body chassis where the rear frame is often already occupied.
- 03
Receiver installation
Hitch mounted with the correct hardware and torqued to specification, with custom brackets fabricated where the bolt-on kit does not fit the frame configuration.
- 04
Harness routing
Wiring routed clear of exhaust heat, moving suspension, and sharp edges, with proper loom and strain relief at every pass-through.
- 05
Sealed connections and dedicated ground
Connections soldered and heat-shrunk or made through the vehicle factory connector, with a dedicated chassis ground rather than a body panel screw.
- 06
Charge line and brake controller
Fused charge line run from the battery on properly sized wire, and the brake controller mounted, wired, and gain-set with a trailer connected.
- 07
Function test under load
Every circuit tested with a load, not just a test light, and the brake output verified with the controller commanding, before the vehicle is released.
05
Pricing and posted rates
| Item | Rate or range | Notes |
|---|---|---|
| Typical job range | $500 to $2,500 | Varies with extent of damage and parts availability |
| Shop hours | 2 to 10 | Quoted after teardown, not before |
| Mechanical and electrical labor | $260 per hour | 2026 posted rate |
| Parts | 100% markup under $100, 35% over | Special order parts require a non refundable deposit at order |
| Deposit | 50% at authorization over $2,000 | Additional 25% when parts arrive on jobs over $10,000 |
| Sales tax | 7.75% on parts and materials | Labor is not taxed |
Insurance billed jobs may be billed at carrier negotiated labor rates that differ from the posted retail rates above. See all posted rates.
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Vehicles we do this work on
Vehicle
Cargo Vans
Cargo vans on Transit, ProMaster, Express, and Sprinter platforms carry trade tools, parts inventory, and route freight. Rear door
Vehicle
Sprinter Vans
Mercedes Sprinter vans run last-mile routes, trade service, and camper conversions across Southern California. Sliding door tracks
Vehicle
Box Trucks
Box trucks put a separately built cargo body on a cab chassis, and the joint between them is where most failures start. Rear frame
Vehicle
Flatbed Trucks
Flatbed trucks carry unprotected loads on an open deck, so the deck, headboard, rub rails, and stake pockets take the damage rathe
Vehicle
High-Cube Vans
High-cube vans trade a tall roof and maximum interior volume for a large flat sail area and a roofline that clears almost nothing.
Vehicle
Utility Trailers
A utility trailer is an open deck on a welded frame with fenders, a ramp gate, and lighting, and it fails through deck rot, frame
Vehicle
Electric Delivery Vans
Electric delivery vans including the Rivian EDV used by Amazon Logistics have a floor-mounted battery pack, bonded composite body
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Questions about tow hitch and 7-way wiring installation
Frequently asked questions
How much does a hitch and 7-way wiring install cost?
Installation runs $500 to $2,500, or 2 to 10 hours at $260 per hour plus parts. A receiver plus a 4-way on a vehicle with a factory tow harness connector sits near the low end. A receiver with custom mounting, a full 7-way, a fused charge line, and a brake controller on a van chassis with no factory provisions sits at the high end.
Why do my trailer brakes pulse with the turn signal?
Shared grounding, almost always. The brake command circuit is finding its return path through the lighting ground, so every time the signal draws current the brake output moves with it. The fix is a dedicated chassis ground for the connector rather than a shared body panel screw. It is also a warning that the existing install has other shortcuts in it.
Do I need a charge line to the trailer?
If the trailer has a house battery, yes, and it needs to be a properly sized fused run from the tow vehicle battery. Tapping an existing accessory circuit gives you a charge line that drops so much voltage under load that the trailer battery never actually reaches full charge, which is the complaint we hear most often from previous installs.
Can you install a brake controller in my vehicle?
Yes, both proportional and time-based controllers, mounted where you can actually reach the manual lever without leaning. On vehicles with a factory tow package we use the provided harness connector. On vehicles without, we run the circuits properly rather than tapping. Gain is set with a trailer connected, not left at a default value.
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Ready to move on tow hitch and 7-way wiring installation? Bring it to Yorba Linda.