There are some salt deposits and corrosion around the battery of my ’98
Nissan Frontier 4WD. I sparyed the area with a solution of baking soda and
rinsed well. I assume that the battery is deteriorating so I will soon
change it.

But just to be sure I did not have an overvoltage problem I measured the
voltage at the battery posts:
Engine off: 13.1 V (OK)
Engine idling: 14.90V
Engine at 1500rpm: 14.92V

Are the 14.90 and 14.92V readings too high?

My shop manual says on pg. EL-30 (Trouble Diagnoses) that battery voltage
at 1500rpm should be less than 15.5V which it is. However on page EL-32
the specifications say that regulated output voltage is 14.1 to 14.7V.
I’m at 14.9. Is that a problem? Of course I used a cheap digital
multimeter but my experience has been that they are nonetheless fairly
accurate.

The charge warning light does not indicate any malfunction. I read in the
manual  (pg EL-30) that the light is designed to detect overvoltage and
will light up (which it does not).

Any suggestions on the 14.9V readings possibly being too high?

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