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Pull up the relay panel. There is a grouped ground right side on a bolt that goes into one of the dash side grab handles. Sand and make good ground and put back together. The main truck ground goes thru a shunt up by the polarity box. So military diagnostics can measure current draw. Poor design...

Ground under the power panel?

In the first gen truck troubleshooting for no start it has you ohm out one of the oil sensors. If it’s open then you don’t get a complete circuit to crank.

I am pretty sure the c7 dash is an electronic bus and is controlled by the engine computer. I have seen a lot of ground issues in a wide variety of trucks. The main ground goes thru a current shunt so current draw can be measured for diagnostics. A little bit of corrosion and you get a bad...

Without the connection you will probably get a charge fault on the dashboard. I have seen alot of the polarity boxes go bad like that.

Unplug the mil connector on the polarity box see if symptoms change.