The voltage gauge on my ford truck runs high?

This can be a sign that the voltage regulator is not working properly. First what is high. A normal battery is between 11 volts and 13.8 volts. When the system is charging a reading of 14 to 14.5 volts is not uncommon. With the vehicle off and the switch turned to on you should see the normal battery voltage. Vehicle gauges have been know to be off due to many different things. Over charging a battery can cause it to explode. I would look over the above information and if it is showing that it might be over charging (above 14.5 volts) get it checked and fixed really soon.