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HandWiki. ISO Standards for Trailer Connectors. Encyclopedia. Available online: https://encyclopedia.pub/entry/33291 (accessed on 10 October 2026).
HandWiki. ISO Standards for Trailer Connectors. Encyclopedia. Available at: https://encyclopedia.pub/entry/33291. Accessed October 10, 2026.
HandWiki. "ISO Standards for Trailer Connectors" Encyclopedia, https://encyclopedia.pub/entry/33291 (accessed October 10, 2026).
HandWiki. (2022, November 07). ISO Standards for Trailer Connectors. In Encyclopedia. https://encyclopedia.pub/entry/33291
HandWiki. "ISO Standards for Trailer Connectors." Encyclopedia. Web. 07 November, 2022.
ISO Standards for Trailer Connectors
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The content is sourced from: https://handwiki.org/wiki/Earth:ISO_standards_for_trailer_connectors

A number of ISO standards cover trailer connectors, the electrical connectors between vehicles and the trailers they tow that provide a means of control for the trailers. These are listed below, with notes on significant deviations from them that can cause problems.

electrical connectors trailer trailers

References

  1. "ARTSA Voltage Troubles". Archived from the original on 2012-03-18. https://web.archive.org/web/20120318144250/http://www.artsa.com.au/articles/2011/2011_07_p86-87.pdf. 
  2. "ISO 11446-1:2012". http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=51374. 
  3. "ISO 11446-2:2012". http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=55704. 
  4. Pin 3, 11 and 13 must not be joined in the trailer[4] to avoid interaction between circuit types and over current if one ground pin isn't working.
  5. Pin 5 and 7 must not be joined in the trailer[4] to avoid problems in vehicles with separate circuits for left and right side.
  6. Previously allocated to trailer detection in ISO 11446:2002 (the vehicle could detect it was coupled to a trailer using a link between pin 12 and pin 3 in the trailer plug). This function was removed by ISO 11446:2004 and the pin reallocated to reserved. The pin remains reserved for future allocation in ISO 11446-1:2012.
  7. "HELLA ELECTRICAL PLUG-TYPE CONNECTIONS". http://www.hella.com/MicroSite/soe/sites/default/files/downloads/J00271_Elekt_Steckverbindungen_EN_HKG.pdf. 
  8. "13-pin 24V Trailer Connectors similar to ISO 11446". Archived from the original on 2012-09-17. https://web.archive.org/web/20120917020943/http://www.jaeger-poway.com/down/4.pdf. 
  9. "ISO 7638-2:2003". http://www.iso.org/iso/catalogue_detail.htm?csnumber=30208. 
  10. "ABS Troubleshooting for Trucks, Trailers, and Buses". http://www.abstroubleshooting.com/iso-7638-lead.html. 
  11. Active low, i.e. when the voltage is below +5V.
  12. CAN bus communication according to ISO 11992.
  13. The CAN bus is not necessary for the ABS to work which means that there are also a 5-pin variant of this connector where the CAN bus pins are excluded.
  14. "ISO 1724:2003". http://www.iso.org/iso/catalogue_detail.htm?csnumber=30212. 
  15. "Wiring Guides". http://www.watling-towbars.co.uk/wiring_guides_watling_towbars.html. 
  16. "7 pin 12N wiring diagram". http://www.towingandtrailers.co.uk/shop/132/133/142/. 
  17. "Bosch - koppling 7-polig med 5- och 7-ledarkabel". Archived from the original on 2013-09-27. https://web.archive.org/web/20130927134343/http://tt.henrix.se/content/transpart/produkter/Elkoppling%207-polig%20Bosch%20fr%20insida%20med%205-%20och%207-ledare.pdf. 
  18. "Mercedes Owner's manual". p. 106. http://www.mbusa.com/vcm/MB/DigitalAssets/pdfmb/ownersmanual/2014_C_Coupe.pdf. 
  19. Glenning, Christer (1976). Allt om bilen. Det Bästa (Readers Digest, Sweden). p. 130. ISBN 9789170300189. 
  20. "NARVA Wiring Diagrams". http://www.narva.com.au/products/browse/wiring-diagrams. 
  21. "ISO 3732:2003". http://www.iso.org/iso/catalogue_detail.htm?csnumber=30210. 
  22. "The British Caravanners Club: Towing Wiring for Caravans and Trailers". http://www.thebritishcaravannersclub.co.uk/Help%20Advice/information/wiring.php. 
  23. Attention shall be paid to the fact that this pin may not be powered if the towing vehicle is manufactured after 1999 and if the trailer has a battery that is charged by the towing vehicle. The result may be that the battery wouldn't be charged as expected.
  24. "ISO 12098:2004". http://www.iso.org/iso/catalogue_detail.htm?csnumber=30203. 
  25. "Your Guide to ABS and EBS". http://www.transportoffice.gov.uk/crt/repository/CONT063837.pdf. 
  26. Pin 5 and 6 must not be joined in the trailer[4] to avoid problems in vehicles with separate circuits for left and right side.
  27. Identification lamps shall be wired to either pin 5 or 6, not both.
  28. "Just the Facts: Brake Pad Wear Sensors". http://standardbrand.com/Standard+-+Just+The+Facts-Brake+Pad+Wear+Sensors/Content.aspx. 
  29. EBS and ABS shall be connected through the ISO 7638 connector.
  30. "13-pin 24V Trailer Connectors similar to ISO 12098". Archived from the original on 2013-09-21. https://web.archive.org/web/20130921055619/http://www.jaeger-poway.com/down/5.pdf. 
  31. "ISO 7638-1:2003". http://www.iso.org/iso/catalogue_detail.htm?csnumber=30209. 
  32. CAN bus communication according to ISO 11992.
  33. The CAN bus is not necessary for the ABS to work which means that there are also a 5-pin variant of this connector where the CAN bus pins are excluded.
  34. "ISO 1185:2003". http://www.iso.org/iso/catalogue_detail.htm?csnumber=30213. 
  35. Pin 2 and 6 must not be joined in the trailer[4] to avoid problems in vehicles with separate circuits for left and right side.
  36. Identification lamps shall be wired to either pin 2 or 6, not both.
  37. "SAE J560: Primary and Auxiliary Seven Conductor Electrical Connector for Truck-Trailer Jumper Cable.". http://standards.sae.org/j560_200902/. 
  38. "Transatlantic connection – A comparison of different standards for trailer connectors". http://www.openpr.com/news/106803/. 
  39. "Truck Lite Trailer Wiring". http://www.truck-lite.com/webapp/wcs/stores/servlet/GenericView?pageName=/productHelp/RegSpecsWiring.jsp&storeId=10001&langId=-1. 
  40. "ISO 3731:2003". http://www.iso.org/iso/catalogue_detail.htm?csnumber=30211. 
  41. "European Truck Trailer suzie pin-out connections". http://www.ratltd.co.uk/truck/pinouts/trailer/. 
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