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More importantly, what's the charging voltage at, say, 3-5000 revs? If it's 14.2v-14.5v then that's normal. If it's still 13.8v, then your charging system may be getting tired.
A single lead-acid cell will start to charge at anything over 2.15v so, as the battery will have six cells, that's 12.9v for a complete battery, (although at that voltage, it would take ages to charge - like a trickle charger). While 13.8v would be at the lower end of what would be expected, under normal circumstances, it should be enough to maintain a healthy battery with no abnormal power drains.
If the maximum charging voltage is actually less than 14v then that, coupled with the tracker, may mean that the battery just can't quite keep up.
Rather than measuring the battery voltage with the tracker active, it would be more revealing to measure the current draw in amperes. Anything more than 50 milliamps could cause problems
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