RP 137D - Antilock Electrical Supply From Tractors Through The Sae J560 Seven-Pin Connector: Definitions

Primary Connector  - The receptacle and cable plug that provides power to safety lighting and the ABS as required by FMVSS 108 and FMVSS 121 (from SAE J560.) This is the seven-pin receptacle/plug and cable discussed in this document.

Auxiliary Connector  - The receptacle and cable plug that provides power to the auxiliary devices on the trailer, but does not provide power to safety lighting and the ABS as required by FMVSS 108 and FMVSS 121 (from SAE J560.) Performance specifications for the auxiliary connector are not included in this document.