I have a PC8 attached to my battery, and a Datel voltmeter wired into one of the slots on it. When I first wired it up four months ago, it consistently read 14.2-14.3V. Then it read 14.1-14.2V for a long time. Recently, it has started showing 13.8-14.0V as the reading. No other farkles of any kind have been added to the bike since I put the voltmeter on there. Should I just ignore it? Is it the stator? The RR? A figment of my overactive imagination?