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Start with the existing trailer and the exact replacement lamp. Matching a lens shape alone does not establish electrical compatibility, mounting fit or the functions you need. Record the supply, lamp functions and physical mounting details before ordering.
This guide helps you prepare a replacement brief. It is not a wiring diagram or a statement that a particular lamp meets every trailer installation requirement. Check the selected model’s current information and resolve any missing detail before installation.
1. Confirm the electrical supply
Record the supply voltage specified for the trailer installation and compare it with the exact lamp’s stated input range. Do not assume that every LED lamp is multi-voltage or that two similar-looking models have the same electrical requirements.
TruVision’s Square Trailer Lamp 10-30V LH Blister is listed as 10–30V. That is a product listing detail, not proof that it will work with every towing vehicle, connector or control system. Confirm any compatibility question for your particular application.
2. List the functions you need
Write down each function of the existing lamp and the required replacement. The selected product listing identifies stop, tail and direction-indicator functions in its tags. Other functions, connectors or accessories must not be assumed from the appearance of the housing.
Check left- and right-hand designations against the model information. If you need a reverse function or a separate number plate lamp, establish that requirement explicitly rather than expecting it to be included.
3. Check physical fit before choosing a shape
Record the overall lamp size, mounting centres, fixing arrangement and space behind the mounting surface. Note any surrounding panels or brackets that could interfere with the replacement. Where dimensions are not available on the listing, request the current drawing before purchasing.
A square lamp can be a useful starting point for comparison, but square housings are not all interchangeable. The same applies to rectangular lamps and their brackets.
Your replacement record
| Record | Why it matters |
|---|---|
| Supply voltage | Compare with the selected model’s specified input |
| Required functions | Avoid choosing a lamp without a needed function |
| Mounting dimensions and rear space | Check mechanical fit before installation |
| Connection details | Verify the actual model diagram and connector compatibility |
| Included components | Establish what still needs to be sourced |
4. Compare an individual lamp with a kit
If only one lamp needs replacement, identify the existing assembly carefully before comparing a single unit. If the installation needs several components, compare a kit while checking exactly what the package includes.
The Square Trailer Lamp Complete Kit 10-30V Blister is one listed option to investigate. The word “complete” does not tell you whether every bracket, connector or cable required by your particular trailer is supplied. Ask for a contents list rather than making that assumption.
5. Resolve connection and approval questions separately
Do not match wire colours or connector positions using a generic diagram from another lamp. Use the selected model’s wiring information and an appropriate installer where needed. If product information does not establish a required approval or installation condition, ask for supporting documentation.
This article makes no road-legality or ADR-compliance claim for a proposed installation. Electrical function, product approval and installation suitability are separate checks.
FAQs
Can I replace a lamp with any LED unit of the same shape?
No. Check voltage, functions, mounting, connections and the requirements of the application as well as shape.
Does a multi-voltage label guarantee compatibility?
No. It describes the listed input range; the complete installation and control-system requirements still need checking.
What should I send TruVision before ordering?
Send the existing lamp identification, photographs, supply specification, required functions and mounting measurements. Highlight any missing connector or approval information.
Next step
Compare the linked TruVision lamp and kit against your replacement record. Resolve missing specifications before purchase and installation.