check charging system question
 

Hi guys im new the forum and I have a question I hope you can help with. I have a 2008 f350 6.4 (105,000 miles) and im randomly getting the check charging system the batterys have a standing voltage of 13.8 and 13.9-14v (read from the ecu with scanner) both at idle and under a load. I also checked the alternator and its making 13.8-14 all the batteries are tight and there is no corrosion. Thanks in advance for any help you guys could provide.

Sorry I know this is a double post im just not sure what section to put it in