![]() Primary and Auxiliary connectors are not interchangeable due to an incompatible layout of pin 1. For a better recognizability, AUX connectors are identified by the color yellow and/or are permanently marked with “AUX”. Auxiliary connectors are used to supply power and control to auxiliary devices (i.e., lift gates, refrigeration power units, dome lamps, etc.). Primary connectors are used to supply power to devices regulated by FMVSS 108 and FMVSS 121. ![]() The standard includes two types of connectors: Primary and Auxuiliary (AUX). The difference in voltage and current requirements makes the standards SAE J560 and ISO 1185 incompatible without the use of additional equipment in the form of voltage converters between trailer and towing vehicle. Additionally, some of the pins in the connector fulfill different functions. The difference is that systems according to the SAE standard run on 12V whereas ISO standard systems use 24V. The plug for SAE J560 is physically identical to the trailer connector according ISO 1185. The standard incorporates plugs, sockets and cables. Its purpose is to transfer the lighting signals as determined by the FMVSS ( Federal Motor Vehicle Safety Standards) from the drivers cab to the trailer and to provide the trailer with continuous ABS primary power. The standard SAE J560 for trailer connectors was originally issued in 1951 to create a standard in the commercial vehicle industry for the electrical wiring between heavy-duty truck and trailer.
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