How to Select a Trailer Hitch
Hitch class still matters before a first tow. Match the receiver to the door sticker, then make plate lights part of the same walk-around as running and brake lamps.
Watch on YouTubeTrailer License Plate Light Tips (Canada)
A dark trailer license plate light is an easy ticket on Canadian roads, and it is often the first clue that the rest of the trailer wiring is tired. This page is practical shop talk: how a plate lamp ties into the same circuit you check on a lights pretest, why green crust at the plug socket matters, and which fuse or tester habits save a roadside scramble. We do not invent legal cutoffs here. If the plate is dark, fix the light and prove the rest of the circuit before you tow at night.
Practical Canada trailer license plate light tips. Free shipping on CURT towing gear from Lots of Parts when the SKU is live on this store.
Related reading: trailer lights pre-trip check, trailer plug corrosion tips, trailer wiring fuse tips, and trailer wiring tester tips.
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Watch these CURT videos first
All four videos are from the official CURT YouTube channel (@curtmfg). Use them for class selection, install habits, wiring basics, and ball-mount height before you dig into the product cards below.
If an embed does not load, use the YouTube link under the card.
Trailer Hitch Installation Techniques
Install habits include sealing and routing. A plate lamp that works in the bay and dies after the first salted kilometre usually points back to a wet plug or a chafed ground.
Watch on YouTubeHow to Connect a Trailer Wiring Harness
Prove vehicle-side power with a plug tester before you blame the trailer plate lamp. A dark plate is often a shared ground or fuse story.
Watch on YouTubeHow to Choose a Ball Mount and Trailer Ball
Ball-mount height will not fix a dead plate light. Finish the electrical walk-around before you worry about rise versus drop.
Watch on YouTubeWhy a dark plate light gets attention
Enforcement does not need a lecture on trailer classes when the plate is unreadable after dark. A missing or burned plate lamp is a simple visibility issue. It is also a useful wiring clue. The plate circuit usually rides with the running-light feed. If that feed is dirty at the plug, shorted at a corroded socket, or open at a blown fuse, the plate lamp is often the first thing you notice because it sits where your eyes go on a walk-around.
We are not writing province-by-province cutoffs or inventing fine amounts. Treat a dark plate as a must-fix before you leave the yard, the same way you treat missing brake lamps or a dead turn signal.
Start with the lights pretest
Do the boring walk-around before you buy parts. Plug the trailer in, have a helper watch, and check running lights, brakes, turns, hazards, and the plate lamp together. If the plate is dark while other running lamps are bright, look local to the lamp, the ground, or the plate housing. If the whole running-light bank is dim or dead, start at the vehicle plug and the harness fuse instead of swapping the bulb first.
Our full walk-around lives on the trailer lights pre-trip check. Use that page when you want the broader checklist. This page stays focused on the plate lamp as a ticket risk and a wiring clue.
Step 1Plug in and pretest
Confirm running, brake, turn, hazard, and plate lamps with a helper before you dig into the socket.
Step 2Inspect the plug
Look for green crust, bent pins, and water in the vehicle and trailer connectors.
Step 3Check fuses
A shorted trailer plug can open a harness fuse. Follow the harness sheet, not a guess.
Step 4Prove with a tester
Use a plug tester on the vehicle side before you condemn the trailer lamp.
Corrosion
Socket and plug first
Salt roads love trailer plugs. Green crust on pins, a loose ground, or a waterlogged socket can kill the plate lamp and half the running-light bank. Clean and dry before you replace good lamps.
- Trailer plug corrosion tips
- Dielectric grease tips
- Thin grease on clean pins, not packed into the connector
Fuses
Harness fuse habits
If the plate and running lights die together after a wet tow, open the fuse path for the vehicle harness before you tear the trailer apart. A shorted plug is a common fuse story.
- Trailer wiring fuse tips
- Follow the harness instruction sheet for fuse location
- Replace a fuse only after you find why it opened
Testers
Prove vehicle-side power
A plug tester tells you whether the tow vehicle is feeding the circuit before you blame the trailer plate housing. That habit saves guesswork on a dark Canadian evening.
- Trailer wiring tester tips
- Light wiring troubleshooting
- Live CURT testers linked below when stocked
What we stock for the electrical walk-around
We do not currently stock a dedicated CURT trailer license plate lamp SKU on this storefront. That is an honest catalogue gap, not a reason to skip the pretest. What we do stock are the plug testers that prove vehicle-side power while you chase a dark plate circuit.
Four-flat testerCURT 58260Four-way connector tester for proving vehicle-side running, brake, and turn feeds before you blame the trailer.
Adapter with testerCURT 57674Dual-output electrical adapter with tester when you need a four-flat to seven-way bridge and a quick check.
If you need a replacement plate lamp housing, use the trailer maker parts path or a local lighting match. We will not invent a CURT plate-lamp SKU that is not live here.
| Topic | What we tell shoppers |
|---|---|
| Ticket risk | A dark plate light is an easy roadside issue. Fix it before night towing. |
| Wiring clue | Plate lamps often share the running-light feed. Use them as a hint, not the whole diagnosis. |
| Pretest first | Open the lights pre-trip check and walk the whole bank. |
| Corrosion | Clean the plug and socket before you replace lamps. See plug corrosion tips. |
| Catalogue honesty | No live CURT plate-lamp SKU here today. Testers 58260 and 57674 are the stocked electrical helpers. |
Related guides worth opening next
Lights pre-trip checkFull walk-around for running, brake, turn, and plate lamps.
Plug corrosion tipsSalt-road habits for green pins and wet sockets.
Wiring fuse tipsWhere to look when a harness fuse opens.
First tow checklistLights, chains, coupler, and tire pressure habits.
Parts-counter summary: treat a dark trailer plate light as both a ticket risk and a wiring clue, pretest the whole light bank, inspect corrosion at the plug, check harness fuses before guessing, and prove vehicle-side power with a tester. We do not stock a CURT plate-lamp SKU today, and we will not invent legal cutoffs. Free shipping on live CURT towing gear from Lots of Parts across Canada when the SKU shows available on this store.
