Posted by John T on April 09, 2019 at 05:33:29 from (107.77.235.196):
In Reply to: 7 way trailer plug posted by T in ne on April 08, 2019 at 21:33:23:
I was a used Truck/Tractor/RV dealer for years and can tell you FOR SURE I saw many many wired different ways, IT DOES AND CONTINUES TO HAPPEN. A lot of the difference I observed depended on the connections for backup lights and 12 VDC auxiliary power (say for toad battery trickle charge or trailer dome lights). NOTE Im NOT saying any were right or wrong, Im ONLY saying over many years and a ton of vehicles I saw different wiring......
As posted THE TWO VEHICLES MUST MATCH for the system to work.
HOWEVER nowadays I see most wired as Bob's picture indicated for RV's and that's how I wire my RV and any toads I pull. On the back of many pickups the 7 pole receptacle and wiring diagram is posted right on the receptacles.
The 6 pole what I call horse trailer plugs were more notorious for using two different wirings. Their difference concerned what pin was used for 12 VDC aux power to run the trailers inside dome light. RV dealers even sold two different 6/7 adapters depending on what pin was used for 12 VDC
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