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this post was submitted on 30 May 2026
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TIL 13 pin towing connector.
In the USA, 4 and 7 pin connectors are typical on automobiles, until entering the domain of commercial trucking. I imagine the 4 pin is unused outside of North America because there is no distinction between red turn indicators and red tail lights, which is a travesty that continues to annoy us.
I've never seen a four-pin trailer connector here. And those limitations you mentioned would probably prevent any trailer with it from being road legal.
Older cars have 7 pin connector (it's common to only use 5 of them), and it's fine for most things. But for the past 20-25ish years, new cars come with 13 pins which has support for some nice things such as charging caravans, etc.
On big trucks like semis the electrical connector to power lights on the trailer is called a 7-way, it had seven pins, next to the two pneumatic connectors, it's a big fat cylinder