Volts Gauge is reading 18 volts on 1994 Ford F-150

My volt gauge is reading 18 volts all of the time. I replaced the altenator and voltage regulator and it still reads 18 volts. Power door locks recently stopped working and I am concerned if it continue to run at such a high voltage I will begin to have more problems.

Asked by for the 1994 Ford F-150
don't rely on your dash volt meter to be accurate. test the actual voltage with a real volt meter.
2 more answers
If you have an external voltage regulator, clean the grounds. Replace the pigtail that plugs into the alternator. Then replace the pigtail that goes to your regulator if the problem persists.
I had the same problem turns out their was a service bulletin for the alternator connector to the wiring harness..I have had two alternators catch on fire.and just replaced a third one, connector fries the altornator but.... there is still-- and you may have the same problem. ... a short somewhere else actually sucking your power and it is not going to be easy to find... you my be having a little issue with your lights dimming at times and the voltage dropping BELOW normal when you turn on the heater as well.?. I need an answer too... you may also have a recall on the cruise control