Alternator for a 8v92

[Robert Johannesen]

Nelson,
I rebuilt my alternators on my 91 WLWB 40. I tried all the tests that
you are hearing about here (including isolating each alt. and letting it try to
pick the load) and when I finally got to the top one, it had black dust coming
out the vents and the bearings were shot. I went ahead and got both overhauled
for $201.00. The nomenclature for them is Prestolite #906011 & 4725JC, Delco
#19010126 (160 AMP), and GM# 1117920. The best source of this info is the data
plate on the alternator when you take it off. I got these numbers from BB and
the Alternators themselves. Be sure and replace the belts so you don't have to
go back into that top one again! (Don't seal it up completely-I ran it about
three hours and went back in to set the correct belt tension before "buttoning"
it up).
Best of luck - by the way, that was 40,000 miles ago and they have been
doing fine.

Bob & Judy Johannesen
91WLWB40, FMCA F72567, WL #1986, Vintage Birds #345
Argyle, Texas

"Ralph L. Fullenwider" wrote:
Hi Greg:

Actually, I have seen it both ways with the dash switch. I have seen the
alts wired to the relays to switch the "view" via a common shunt and they
also pulled in the coil of large solenoids to switch out the alt. Then I
have seen the alts going to an isolator and the dash switch only switched
out the view but not which alt was being used. Personally I would want both
alts putting out and only see the view of each one via the dash switch.

The isolator can be just that or BB used solenoids as isolators as well,
with an and or configuration. These solenoids are separate from the above.

Generally though, the alts are usually working but the view wiring is the
actual problem.

Then we get into the huge 300 amp oil cooled alt. Whew, hate to get that
one rebuilt.

Safe travels,

Ralph and Charolette Fullenwider
Ralph's RV Solutions, Duncan, Oklahoma
http://home.swbell.net/rlf47/index.htm

At 04:51 PM 11/27/2005 +0000, you wrote:
>Ralph, I too wonder if my Alts are working. I run the gen often and
>plug in all the time so charge has never been an issue. Is the dash
>switch used to view the reading or does it switch the alts on and off?
>Gregory O'Connor
>94pt40 Romoland CAlifornia
>--- In WanderlodgeForum@yahoogroups.com, "Ralph L. Fullenwider"
> wrote:
> >
> > Good morning Nelson:
> >
> > There are 2 Bosh relays (among several)(and they are usually turned
> > backwards, so you can't readily see the contacts) on the curb side
>behind
> > the access grill to the batteries area, that control the out put of
>the
> > alternators. This is selectable by the switch on the dash, alt 1/
>alt 2.
> > The connection to those relays could be corroded or the relays bad.
>That
> > would the first thing to check. Then check the out put from the
>alts.
> > though I agree, the one on top is a bear to get to.
> >
> > Safe travels,
> >
> > Ralph and Charolette Fullenwider
> > Ralph's RV Solutions, Duncan, Oklahoma
> > http://home.swbell.net/rlf47/index.htm
> >
> > At 02:58 PM 11/27/2005 +0000, 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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