Trailer Wiring and Lighting Repair in Laval

A few symptoms and their most likely cause:

• All the lights come on or flash at the same time: almost always a bad ground, with the current finding another path through the bulbs.
• Dim or flickering lights: corroded ground, oxidized connector or pinched wire.
• One side does not work: broken wire, failed splice or burnt socket.
• Intermittent fault: wire rubbing against the frame, connector taking on water or harness crushed by a side panel.
• Electric brakes with no effect: cut brake wire, failed magnet ground or damaged 7-pin connector.

Replacing bulbs at random wastes time and fixes nothing. Our diagnosis always follows the same order:

1. Test at the trailer connector with a tester: we confirm that each function (running lights, turn signals, brake lights, electric brakes, 12 V feed) actually reaches the trailer.
2. Isolate the cause: if the signal does not reach the connector, the problem is on the vehicle side and we tell you so; if it does, we follow the trailer harness.
3. Multimeter checks of continuity, voltage and ground resistance, circuit by circuit.
4. A lasting repair instead of electrical tape: sealed connectors, heat-shrink tubing and wires secured away from sharp edges and moving parts.

The connector is the most exposed part: it drags, takes on water and road salt. We repair or replace the trailer-side connector and its junction box.

• 4-pin flat: ground, running lights, left turn/brake and right turn/brake. The standard on small trailers without electric brakes.
• 7-pin (RV style): adds the electric brake output, a 12 V feed (charging the breakaway battery or an RV battery) and an auxiliary or reverse circuit. The connector for braked trailers and RVs.
• Adapters: we sell 7-to-4-pin adapters and vice versa, but an adapter never replaces a missing brake circuit.

Most trailer lighting failures come from the ground. A trailer uses its frame to carry current back, but paint, rust, galvanizing and bolted joints break that path over the years.

• Dedicated ground wire of adequate gauge, from the connector to the frame and to each light where needed
• Ground point cleaned to bare metal, bolted and protected against corrosion
• Separate, verified ground for the electric brake magnets
• Ground check between the tongue and the rest of the frame on bolted trailers

LED lights draw little power, resist vibration and are more visible than incandescent bulbs. We convert your trailer or RV lighting:

• Combination tail lights (running, brake, turn) and licence-plate light
• Clearance and identification lights and reflectors according to the trailer's width and type
• Work lights and ramp or box lighting on request
• Full harness replacement when the original wires are burnt or corroded

Lighting requirements vary with the trailer's width and type: we install complete lighting and advise you, but the SAAQ is the authority on the standards that apply to your unit. Before a mechanical inspection, see our pre-SAAQ inspection.

Our service covers the trailer and the RV. Tow-vehicle wiring is not installed by our shop: the vehicle socket, T-connector harness, towing module and brake controller are installed on the vehicle side. We sell hitches and towing accessories, but installation on your vehicle is not offered. Our test at the connector will still tell you whether the problem comes from the trailer or the vehicle.