2005 F150 STX 4wd 4.6L auto:
Alternator normally reads 14.2 to 14.6 volts, now it is reading14 to 13.7. Is this an issue, it is hot and the battery is fully charged, I keep it on a tender when not in use.

 

I think you answered your question by saying the battery is fully charged. I do not see any need for concern.

 

It is fully charged because it is on the tender. My concern/question is if it is normal for the voltage to lower because of higher temps or if the battery is fully charged from the tender would the alternator charge voltage drop a few tenths. Reading elsewhere it says the alternator should put out between 13 and 14.6 volts, quite a spread. I had never seen it below 14 so was curious as to what was happening with the unit.