TRAILER WIRING INSTALLATION

Trailer Wiring Installation in Littleton, CO

Your trailer's lights, brakes, and turn signals all run through the wiring connection between your vehicle and trailer. When that connection is corroded, loose, or just wrong for your setup, you get the classic symptoms: lights that work sometimes, a turn signal that blinks fast, or a trailer that's dark on one side.

What we do

We install, repair, and upgrade trailer wiring on trucks, SUVs, and vans:

• 4-way flat connectors- the basic setup for small trailers. Running lights, brake lights, turn signals. No trailer brakes.
• 7-way round connectors- the full setup. Everything the 4-way does, plus electric trailer brakes, 12V auxiliary power, and reverse lights. This is what you need for campers, car haulers, and any trailer with brakes.
• Wiring harness installation- vehicle-specific plug-and-play harnesses that connect to your factory wiring without cutting or splicing. Available for most trucks and SUVs from the last 20 years.
• Wiring repair and troubleshooting- corroded grounds, broken wires, bad connectors, shorts that blow fuses. We chase wiring problems every day.
• In-bed 7-way plugs- for gooseneck and 5th wheel towing, we install a 7-way connector in your truck bed so you're not draping the trailer cord over the tailgate.

4-way vs. 7-way: which do you need?

If your trailer has electric brakes, you need a 7-way. No exceptions. If it's a small utility trailer, jet ski trailer, or pop-up without brakes, a 4-way is enough. When in doubt, go 7-way. It covers everything and costs a little more upfront, but you won't have to rewire later when you upgrade trailers.

Common wiring problems we fix

• No lights on the trailer at all- usually a blown fuse in the tow vehicle, a corroded ground wire, or a bad connector.
• One side dark- broken wire or bad ground on that side.
• Turn signal blinks fast- the vehicle thinks a bulb is out. Often a wiring issue, not a bulb issue.
• Brakes lock up or don't engage- brake controller wiring problem, bad ground at the trailer brakes, or a shorted brake wire.
• Intermittent problems- the worst kind. Usually a wire that's rubbed through somewhere and shorts when the trailer bounces. We find these by testing every circuit under load.

What professional installation gets you

• Vehicle-specific harness when one exists for your truck (cleaner, more reliable than universal splice-in kits)
• All connections soldered or sealed with heat-shrink, not just twisted together with electrical tape
• Wires routed away from heat, sharp edges, and moving parts
• Every circuit tested with a trailer connected before you leave
• Dielectric grease on connectors to slow corrosion

How long does it take?

A basic 4-way or 7-way install on a truck with a plug-and-play harness takes about an hour. Custom wiring, troubleshooting, or in-bed plugs take longer. Wiring diagnostics are billed by the time it takes to find the problem, and we'll give you an honest estimate before we start digging.