I have a 2006 f150 and the issue I have is that my battery dies while I'm driving. I replaced alternator and battery and I have no issues with guages or losing any power

 

If you had a shop do it, take it back. If not, check and clean all of your terminals/connections. Then test to see if alternator is actually charging the battery. If you don’t have a meter, go to a parts store and ask them to test both batt and alternator (usually a free service, especially if you bought it there and did diy install).