Slack in 7-pin Cord

Probably not on topic, but due to open heart surgery I did not drive my 2010 Ram CTD for several months. I went to start it and starter solenoid clicked. Put 2 battery chargers on it and same click but wipers came on. After batteries charged it started but seemed weak and trailer connection warning displayed (trailer 500 ft away). It was also stuck in 4th gear (cruise on for fast idle). It is an automatic trans. Test drive and was in fact stuck in 4th gear! This was all from a low voltage condition. Disconnected Power distribution box pos lead and held brake pedal down 30 sec and tranny came back and power too but CEL now on. Remote start will start it but dies after 5 secs. Reset 7 problem codes and all is great again. My point is low voltage is nothing to play with on Rams and you need to have a second opinion or a third so you do not go thru what I did. My old 1989 Chevy 3500 I could jump start and drive away. The good old days!!!!