Probably a dumb question and kinda new so here goes.
‘16 Laramie CC MM3 tuner.
Truck sat for 3 days with less than a year old batteries 20 degrees and no juice.
Same thing happened about a month ago.
Load tested batteries and they tested fine.
I’ve read/heard that unplugging mm3 from obd-2 port would likely help.
Thoughts?
Last time I put the charger on it for a few hours and fired right up no issue.
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