With the many methods of towing in the RV world, you must have an electrical connection between the RV and the towed vehicle for lights turn signals brakes etc.. Pre-made cables are available at most Camper part stores, as well as kits for wiring into the wiring harness of vehicles.
RV Coaches have the 6-pin or 7-pin connector mounted near the Hitch. Some of the wiring systems are simpler than others, but there are standards for the connectors and wiring. Here is a short overview of the connectors:
a. 4-Pin Connector-
The standard 4-pin connector is a flat plastic connector, with 3 pins either male or female, and the 4th pin the opposite sex. The connector shown is for the wiring of the towing vehicle. The pins and their usage are;
PIN-1=Ground (male pin) White wire,
PIN-2=Tail Lights (and license plate light and side lights)= Brown Wire,
PIN-3=Left Turn & Stop Lights (Yellow Wire),
PIN-4=Right Turn & Stop Lights (Green wire).
b. 6-pin Connector
The standard 6-pin connector is a “Keyed” round metal connector with the following connections. Those shown are from the wiring side of the towing vehicles connector. The Pins and their usage, are;
PIN-A (center pin = 12V (and is either red or Black),
PIN-TM -(at the guide) = Tail Lights (usually Brown wire),
PIN-GD =Ground (usually White),
PIN-LT=Left Turn Signal (usually Yellow),
PIN-RT=Right Turn (usually Green), and
PIN-S= Electric Brakes (usually Blue). This pin is used to provide a variable voltage to the electrical brakes of larger tow trailers and campers to assist in stopping them.
c. 7-Pin Connector-
PIN-1=Ground (usually White),
PIN-2=Electric Brakes (usually Blue),
PIN-3=Taillights (usually Green),
PIN-4=12V (usually Black),
PIN-5=Left Turn (usually Red),
PIN-6=Right Turn (usually Brown), and the
Center PIN= Auxiliary Power or Backup Lights (can be wired for either)
by Don Bobbitt, 2015
Copyright Don Bobbitt, 2015, All Rights Reserved
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