More battery/voltage help needed

[Jeff Miller]

As many of us know, BlueBird installed an internally regulated
Motorola, an externally regulated Motorola, and an internally
regulated Leece-Neville with external voltage sense as original
equipment on the 3208 Cat. The internally regulated Motorola is in my
opinion and experience a very good unit and adjustable.

You will need to discover which you have.

- Jeff Miller
in Holland, MI


--- 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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