![]() It includes the test procedures, design, and performance requirements. This SAE Standard provides the minimum requirements for primary and auxiliary jumper cable plug and receptacle for the truck to trailer and converter dolly jumper cable systems for 12 VDC nominal applications. Primary and Auxiliary connectors are not interchangeable due to an incompatible layout of pin 1. It includes 4 light wires and 1 ground wire. For a better recognizability, AUX connectors are identified by the color yellow and/or are permanently marked with “AUX”. This trailer wire harness is 25 feet long with a standard 4- way/4 pin flat plug. ![]() Learn how to install the trailer wiring on your Jeep. Auxiliary connectors are used to supply power and control to auxiliary devices (i.e., lift gates, refrigeration power units, dome lamps, etc.). This video covers the wiring harness installation for part number U-Haul 14488 on a 2018 Jeep Wrangler. 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. This US-made trailer wiring kit powers the lights on a trailer while protecting your bikes wiring system and, on newer bikes, the. 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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