Alternator for a 8v92

[nelson slinkman]

Tom,
Thanks for the advice I will check that tomorrow. I
will let you know the results. It's too cold now.

Thanks
Nelson

--- Tom Warner wrote:

> Remember you only have current flow out of the
> alternators IF you
> have a good ground at the alternator and IF you have
> a complete path
> for current to flow. If you use a voltmeter then you
> dont have to
> worry about current flow. When I first got my 1982
> FC35 the ground
> was intermittent from my alternator. The BB factory
> had installed the
> ground from the alternator to the top of the air
> compressor and over
> the years it had built up corrosion.
>
> Here is what I would recommend. With the engine off
> touch use either
> a voltmeter or a mechanics light (12VDC bulb with a
> positive and
> negative probe) in the following manner. Black lead
> to ground, red
> lead to the +_(positive ) terminal on the
> alternator. You should read
> approximately 13.2 Volts or what ever the voltage
> output of the
> battery is. If you dont read anything, then
> somewhere between the
> battery and your alternator you either have a bad
> ground or a break
> in your positive cable. If you do have an isolator
> that could be your problem.
>
> If you do read approximately 31.2 VDC at the
> alternator + terminal,
> start the engine and see if the voltage increases to
> approximately
> 14.2 VDC. If you get any voltage at all wait and
> see if it gradually
> starts to rise indicating your batteries are
> charging.
>
> I still have a feeling you have good alternators. I
> have never seen
> both go out at the same time.
>
> good luck
>
> tom warner
> 1982 FC35
> Vernon Center,NY
>
>
> At 04:34 PM 11/27/2005, you wrote:
> >Tom,
> >Thanks for your advice. What I did today was check
> the
> >output of each alternator with a amp meter (Loop
> >type). I checked the large cables coming from each
> >alternator that was terminated at the fire wall in
> the
> >battery compartment and not was able to get a
> reading
> >at all. If I plug the bus into shore power I am
> able
> >to get get about 5 amps, and I also get a reading
> on
> >the amp meter on the dash. I assume this is from
> the
> >battery chargers. Any other advice would be
> >appreciated.
> >
> >--- Tom Warner wrote:
> >
> > > Nelson dont assume that both alternators are
> bad. I
> > > suggest you check
> > > the voltage at the output of each alternator and
> > > then if you get a
> > > reading there the input to your isolator if you
> have
> > > one in the 1994.
> > > It is unlikely that both alternators would go
> bad at
> > > once. I would
> > > look for another problem. This is where a good
> > > voltmeter pays for
> > > itself as you trace the path from the alternator
> to
> > > the batteries.
> > >
> > > Tom Warner
> > > 1982 FC35
> > > Vernon Center,NY
> > >
> > > At 09:58 AM 11/27/2005, you wrote:
> > > >Does anyone know the brand and part number for
> the
> > > alternator used on
> > > >a 1994 detroit 8v92? My fault light is on and I
> am
> > > not getting any
> > > >current output on either aleternator. I was
> able to
> > > check the rear
> > > >unit and belts are tight.
> > > >Anyhelp would be apreciated.
> > > >
> > > >Nelson SLinkman 1994 40'
> > > >Westminster, Md
> > > >
> > > >
> > > >
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