Alternator for a 8v92

[Tom Warner]

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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