Battery light

boys this light is getting to me put in new alternator and batterys both batterys are holding charge running at 14.6 and alternator is running good what is throwing the code P0620 thanks

bump

sdont know the code but have you made sure all the grounds are tight and clean?

live life full throttle

ya there all good

do the 6.4s have the fusible links?

live life full throttle

Not sure if this will help but had problem on my 2012 with battery light on and finally found a wire harness rubbed through on cross member causing a wire to ground out on frame,. Unfortunately Found the problem when the wire harness went up in flames.Spliced wires and all is good now.