Etrailer 7 way trailer wiring diagram illustrates the center pole as auxiliary orange while the trailer color codes lists Back Up lights purple and no mention of auxiliary orange. Please explain the center pole. Also is 12volt red/ black the same circuit as battery charger black and Auxiliary what ever color?
Expert Reply:
The center post, see photo at right, on the 7 way connector can be used for many different purposes, although it is typically used to carry the signal from the reverse lights on the vehicle to the trailer. If the trailer does not have reverse lights or a reverse lockout for hydraulic surge activated trailer brakes, this pin can be used for any purpose such as providing an additional 12 volt circuit for any accessories on the trailer.
The dedicated 12 volt accessory circuit, # 4, on the connector, see photo, can be used to maintain a trailer mounted battery, or for any other accessories installed on the trailer such as interior lighting.
expert reply by: Mike L
