2012 cascsdia difficult start

14.7 means the ‘alternator sense’ fuse is blown, so the alternator won’t charge properly, although it tends to overcharge in that case.
So your batteries maybe be cooked.
12.0 to 12.3 after sitting in the cold is not uncommon.
The Alt Sense fuse is 5 amps located in black box on fire wall just under the steering column.

 

Please keep in mind that nothing lasts for ever and if those are 2012 batteries and they're just now acting up, you got your monies worth. It's time for renewal, thanks.

 

Is it cranking slow or is it cranking for a long time before it starts?

 

I had that problem in a couple of trucks I've owned two other years and it could be one of a few things. First of all make sure that when you're checking your battery you are checking each and every one independently and not all together. check the voltage if one of them is bad it'll slow your start. The other problem I encountered was I had to open the switch and count to ten so that the fuel pump would Prime itself and then it will start up immediately. Now I have an international and I'm having the same issue I have to open the key switch, wait a second or two and it kicks in quickly. Good luck

it will drain you down and slow your startup.