'98 Frontier. Overvoltage?

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?


--
Message posted using http://www.talkaboutautos.com/group/alt.autos.nissan/
More information at http://www.talkaboutautos.com/faq.html

On Jan 29, 12:19 am, "ThomasE" <leste... DeleteThis @yahoo.com> wrote:
> 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?
>
> --
> Message posted usinghttp://www.talkaboutautos.com/group/alt.autos.nissan/
> More information athttp://www.talkaboutautos.com/faq.html

Looks like you answered your own question. Basically, overvoltage is
only a problem if it is over 15.5 V. 14.9V is nothing to worry about.

CD