The 7 blade and 4 flat are the most common from my experience. Usually you have the 7 blade on larger trailers and rvs with things like electric brakes and constant battery power. The 4 flat is popular for small trailers with just marker and turn signals.
Any trailer I own is going to have one of the above two connectors. Any towing rig is also going to have one or both of those two connectors. For rigs with only a 7 pin, a 7 pin to 4 pin adapter will be kept with the rig. Generally a vehicle with only a 4 pin connector is small enough you shouldn't be towing a trailer which needs a 7 pin connector. Note that a 7 to 4 adapter needs electronics to combine the turn and brake lights. Right now my vehicle collection only has 4 pin connectors. I expect this to b change in the very near future. There are lots of adapters available for others if you run into them, such as https://www.etrailer.com/Wiring/Hopkins/HM47570.html . The challenge as you have found is that there seems to be lots of standards out there one you get outside of the 4 flat and 7 blade connectors, with those 6 pin round ones being probably the worst offender (although the 5th wire in a 5 flat connector comes close) On Mon, Aug 6, 2018, 8:16 AM Chuck McCown <ch...@wbmfg.com> wrote: > I have a bunch of trailers and a bunch of trucks. I even have a semi > truck. > Is there a wiring orientation that is more used than the others? > I have found so many different socket and plug diagrams that I find it > amazing that it has never been standardized. > > I am going to build a converter so I can plug the semi tractor into some > of my other trailers that the the flat blade connectors. > It will take an electric brake controller in the semi and some kind of > diode box to combine some of the lines. Those are available on the retail > market. > > But the number of connections and the wiring of the connections seems all > over the map. > > Opinions please. > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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