More battery/voltage help needed

[Stephen Birtles]

The original Motorola Alternator on our 1977 is internally regulated
If in doubt about the specs of your particualr Alternator take the
numbers off the id plate to a reputable automotive supply house and
ask them to cross check the numbers against the manufacturers specs.
That will generally give you the information to make an informed
decision without guessing
Stephen 77fc35




--- In WanderlodgeForum@yahoogroups.com, Tom Warner wrote:
>
> 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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> >
> >
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