Tried to start truck this morning and it just clicked, sounds like starter solenoid kicking in but motor never tries to crank at all. If held in start position it just clicks/taps approx once per second. Also getting a P2509 code (ECM/PCM Power Input Signal Intermittent). Both batteries show approx 12.5v at rest.

Truck is late 2012 model 2500 Laramie Longhorn 4wd mega

 

Hi sounds like loose battery cable, check battery post for loose cables

 

Classic sign of dead or excessively drained batteries.