Have Ford Questions? Ask a Mechanic for Answers ASAP
If the vehicle is still starting and running normally then I would suspect the connector at the back of the instrument cluster or a solder connection in the cluster. A lot of communication takes place in the cluster on this truck. If the cause was in the communication network through the cluster then the truck would stall and not start back up again.
I would probably start by checking the connector in the back of the cluster. If you bang on the dash when the problem is occurring will it start working again?
That's definitely too high. I've never seen an overcharging alternator interfere with the instrument cluster, but the circuit is definitely built in to shut it off in the event of an overcharge. Anything over 15 volts is too much so I would definitely think that could be the problem.
Please don't forget to rate. Just answer compensates me based on your positive rating.