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This SAE Standard provides the auxiliary requirements for automotive or RV, additional 12 position, sealed Trailer Tow Connector Plug and Receptacle. The information included within this specification is intended to cover the test methods, design, and performance requirements of optional features for additional power, clean ground for electronic functions, video, data communication, and supplementary electric brake control.

This SAE Recommended Practice covers the wiring and rectangularly shaped connector standards for all types of trailers whose gross weight does not exceed 10 000 lb (4540 kg). These trailers are grouped in SAE classes 1 through 4 as delineated in SAE J684e (August, 1974), with running light circuit loads not to exceed 7.5 amps per circuit. This recommended practice provides circuits for lighting, electric brakes, trailer battery charging, and an auxiliary circuit color coding and protection for the wiring from hazards or short circuits. Color coding is compatible with SAE J560b.(September, 1974) and ISO (1724-1975(E)).

Procedures included within this specification are intended to cover performance testing at all phases of development, production, and field analysis of electrical terminals, connectors, and components that constitute the electrical connection systems in high power road vehicle applications that operates at either 20 V to 600 volts regardless of the current applied or any current greater than or equal to 80 A regardless of the voltage applied.. These procedures are applicable only to terminals used for In-Line, Header, and Device Connectors and for cable sizes up to 120 mm2 (4/0). In cases where power levels are mixed in the same connector, (i.e. sensing or normal 14.5 volt system circuits with High Power Contacts) the High Power Contacts must pass J1742 requirements, and all other contacts must pass SAE J2223-2 requirements. The connection system (housing and high power contacts) shall meet J1742 requirements.

This SAE Standard covers general requirements and terminal interface dimensions of various sizes of pin and receptacle type terminals.