More battery/voltage help needed

[Tom Warner]

Scott you are describing one of the most difficult areas for most
people to understand since in my experience it is not very well
described anywhere I have found.

If you have the original Motorola alternator it is EXTERNALLY
regulated and you will find the prestolite 8RH2024 regulator
installed towards the front of the battery compartment on the back
wall. BB designed it that way to compensate for the undersized
battery cables (and there long length)they used on the forward control BBs.
If you do not have the original Motorola alternator installed then
you more then likely have a Leece-Neville internally regulated
alternator installed and the prestolite regulator should no longer be
in the circuit. Depending on which alternator model you have
installed the cut in voltage may be higher then your high idle for
the engine. If you check the pully size on the alternator and the
pully size of your engine you should have a 3" pulley on the
alternator and a 5 5/8" pulley on the engine giving you a ratio of
1.875, that is the alternator will be rotating at 1.875 times the
engine RPM. If you are idling at 1200 RPM then your alternator is
rotating at 2250 RPMs and if you have a Leece-Neville 8LHA2121V
alternator installed (representative of the 160 amp
alternators) http://www.prestolite.com/index.php. , you will be
putting out approximately 80 amps.

When you first install new batteries( or have discharged your
batteries while drycamping) they probably will not be fully charged
so when you start the engine the voltage at the battery terminals
will be around 12.5 to 13.2 volts and will slowly climb to 14.2 volts
when they are fully charged. These voltages are only typical and your
specific batteries and cables may change them.

One of the best upgrades you can make to a forward control in my
opinion is to move the chargers to the compartment under the
passenger side to sharply reduce the cable lengths.

Tom Warner
1982 FC35
Vernon Center,NY



At 08:59 PM 12/29/2005, you wrote:
>OK guys...I need more help.
>
>My coach now has four brand new T105 batteries. With my engine
>running at "high idle" (about 1200 rpm), a multi-meter reading at the
>alternator reads 13.6. This is also the voltage shown at the
>batteries with the engine running and at the voltage gauge.
>
>Is this normal? Before I installed the new batteries, the voltage
>gauge usually registered above 14 when running. Is this because the
>new batteries are new and require less output?
>
>I am asking all this because it seems like these new batteries are
>not as strong as the old ones "at rest", leading me to wonder if they
>are not being charged enough while the engine is running.
>
>Thanks,
>Scott Forman
>82 FC35RB
>Memphis
>
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