Virtually all Cummins engines have a 3-pin connector near the ECM. This includes commercial trucks, off-highway equipment, and automobiles as well.
Drew Tech Cummins 3 Pin Cable for DrewLinQ
This is a genuine DrewLinQ cable and would be used for those applications. This J1939-11 backbone cable is also for use on J1939-11 Twisted-Shielded-Pair (TSP) networks using the Deutsch 3-pin triangle connector. Comes with 20 foot battery/power cable with battery clips and banana plugs.