Application of ISO 1724 Type NĬonnectors according to ISO 1724 can only be used for simple trailers because the 7 pins can only transfer the most basic lighting functions. Due to a different contact arrangement whithin the connectors, users can not accidentally plug a normal plug into a supplementary socket and vice versa. For a better recognizability, the "normal" system features a black housing while the housing of the supplementary system is white. The "S" stands for "supplemental" as Type S connectors transfer additional functionalities - for example the steady plus for a caravan. There is also a "Type S" for 7-pin 12V trailer connectors which is defined in the standard ISO 3732. The standard has the addition "Type N" for "normal". Its purpose is to transfer the lighting functions so that the trailer's lighting corresponds to the car's lighting. The first version of the standard dates back to 1980. You can read and enjoy this article and share it with your friends, but if you want to use it commercially then you must have the authors permission, in writing.The standard ISO 1724 for trailer connectors was developed in the late 70s to create a standard for the electrical connection between towing vehicle and trailer. PIN-6=Right Turn (usually Brown), and theĬenter PIN= Auxiliary Power or Backup Lights (can be wired for either)Ĭopyright Don Bobbitt, 2015, All Rights Reserved Those shown are from the wiring side of the towing vehicles connector. The standard 7-pin connector is a “Keyed” round metal connector with the following connections. This pin is used to provide a variable voltage to the electrical brakes of larger tow trailers and campers to assist in stopping them. PIN-LT=Left Turn Signal (usually Yellow), PIN-TM -(a t the guide) = Tail Li ghts (usually Brown wire), PIN-A (center pin = 12V (and is either red or Black), Those show n are from the wiring side of the towing vehicles connector. The standard 6-pin connector is a “Keyed” round metal connector with the follow ing connections. PIN-4=Right Turn & Stop Lights (Green wire). PIN-3=Left Turn & Stop Lights (Yellow Wire), PIN-2=Tail Lights (and license plate light and side lights)= Brown Wire, The connector shown is for the wiring of the towing vehicle. The standard 4-pin connector is a flat plastic connector, with 3 pins either male or female, and the 4th pin t he op posite sex. The most commonly used tow connector is the 4-pin connector. Here is a short overview of the most popular connector wiring standards: Some of the wiring systems used for connecting a tow vehicle with a TOAD (or towed vehicle) are simpler than others, but there are standards for all of the connectors and how they are wired. RV Motorhomes will have either a 6-pin or 7-pin connector mounted somewhere near the Hitch for connecting to the towed vehicle. And every smart RV owner learns what those wires do, and what the symptoms are when there is a bad connection. Pre-made cables are available at most Camper part stores, as well as kits for wiring into the wiring harness of vehicles. 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.
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