Quote Originally Posted by JAFO View Post
I just picked up the truck, and they couldn't diagnose it.

They ran the batteries on the dealership's GR8 chargers overnight and held a charge.

This is weird because we ran the batteries on a jumper cable for an hour with no increase in voltage.

They said there were no issues with the TIPM.

I guess we'll see come the morning.
I would recommend checking the voltage on both batteries prior to starting in the morning.

If they are holding a charge and there isn’t a large parasitic draw they should both be between 12.5 to 12.7 Volts.