This content was compiled automatically and has not yet been reviewed by a technician. For reference only.
For reference only. Always confirm part numbers and procedures for your specific vehicle.
Wiring and Electrical Protection
2026 Tank 300 Trailer Harness: Keep 12-Pin Identification Separate from 12V
Distinguish the MY26 Tank 300 Luxury 12-pin trailer harness entry from voltage, pin assignments and interchangeability.
Trailer lamps do not illuminate, but the job card only says “a 12V cable is needed”. That can turn a trailer connector requirement into an ordinary power-cable enquiry. The Mexican 2026 Tank 300 Luxury factory entry is for a 12-pin trailer harness. Recording the pin count correctly makes further connector checks more useful.
Identify the actual factory entry
The exterior equipment sheet lists both towing preparation and “Arnés de 12 pines para remolque”, the 12-pin trailer harness entry. [T04] Pin count describes the number of connection terminals; 12V describes voltage. They cannot replace each other. Listing 12 pins does not disclose each pin's signal assignment.
Retain photos of the vehicle-side connector face, its mounting location and the trailer-side connector, and state which lamp circuit or function is abnormal. If an adapter was previously fitted, record it separately so this intermediate accessory remains part of the investigation.
Pin count alone does not establish interchangeability
Distinguish the vehicle-side harness, connector housing, trailer-side cable and adapters when purchasing. The factory sheet does not establish whether these items are sold separately. The same 12-pin count does not prove that complete harnesses interchange, and connector appearance alone cannot determine wiring assignments.
Scope and verification
This article is limited to Mexico; MY26; GWM TANK 300; Luxury 2.0T HEV. [Model year and trim basis][T01] Factory equipment information identifies functions and parts; it is not a fault or replacement criterion.
No public data were available for 12-pin assignments and load requirements, OE numbers for individual harness sections, diagnostic parameters, separate supply or interchangeability. [To be verified] No public data were available in the reviewed material for OE numbers, repair parameters, separate parts availability or compatibility and interchangeability. [To be verified] Compatibility or interchangeability must be checked using the vehicle identification number (VIN) and the local factory parts catalogue in Mexico.
For parts discussed here, use the parts enquiry page.
[T01]: https://www.gwm-mx.com/content/dam/gwm/pages/mx/es/pdf/Legales_Oferta_comercial_abril2026.pdf
[T04]: https://www.gwm-mx.com/content/dam/gwm/pages/mx/es/pdf/fichas/gwm-tank300-ficha-tecnica-2026.pdf
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