Posted by welding man on April 09, 2019 at 05:17:45 from (76.9.238.216):
In Reply to: 7 way trailer plug posted by T in ne on April 08, 2019 at 21:33:23:
I have been selling and installing trailer hitches, brake controls and wiring electrical plugs since back in the early seventys. Probably have wired thousands. Ford, GM and Dodge have used the standard 7 prong plug wiring code for years. Most of the good trailer manufacturers also use that code. The color of the wires going to the plug means nothing. The code markings on the back of the plug is the Key. Left turn--Red Right turn-Brown Running lights -Green Ele Brake--Blue Aux 12V--Black White --Ground Center Pin-Yellow--Back-up Lights-Everyone thinks this is the ground- IT IS NOT!!! This code was developed by the RV industry many years ago. IT is for the plug with 6 flat pins and a round center pin. This is the code used by all the new vehicle manufacturers. If you wire your trailer any other way than this, you will have problems. Now if you decide to go with the plug that has all round pins, like used on a class 8 tractor and trailer the code is different.
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