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The voltage control goes through the cluster. These trucks have a bad issue of building corrosion on the plugs in the back of the cluster. I would pull those plugs and clean them with electrical contact cleaner (you can buy the can for $6.99 at any auto parts store) and let them dry for about 5 minutes, then plug them back in. See what it does after. If the issue continues, have the cluster tested with the PTT program. If these clusters lose power, they will keep the truck from starting. The starter signal comes from the Vehicle Control Module and if it can't see the cluster, it will not start the truck.
I believe the 2 issues you have are related to the one issue in the cluster. Your starting and your voltage are both affected by the cluster. Otherwise, there are no other modules in place.
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