2015 Prostar voltage issues, fluctuates between 13 and just under 14

Sounds to be a ignition relay issue

 

See if any of the relays are hot to the touch

 

They don't feel hot to the touch. I guess there no outward signs of one goes bad? This is what I see when I turn the key to the off position.

 

Looks like you don’t have a scanner - I’m going to tell you to just start trouble shooting blind. Take each out of the relay out / and then put it back in - till you get to the relay that shuts the truck down

 

I took all the relays out one by one and nothing shut the truck off. Does that point to the ignition switch then? I mean if the truck turns on without issue then the switch should be working as intended right? This is a head scratcher for sure!

 

Without a scanner it’s really shooting in the dark. To eliminate the ignition switch diagnosis - all you do is remove the fuse for the ignition - if it doesn’t shut off - you know it’s the switch
Because the fault is showing up on the dash - it could be ECM related

 

I have this little scanner that works half the time. Just plugged it in and this fault came up. Any ideas?

 

I added a picture of the code in the last post

 

1552 is an EGR code

 

I think that is about the same time they started using the body controller to send ignition signals out instead of relays. Try to reboot your body controller by disconnecting cab power or just disconnect your batteries for 30 seconds and reconnect and retest.

 

With all those warning lights on and "Electrical Fault" in the display I suspect you have a data-link problem.