Front Alternator 8V92

[Donald Watson]

I appreciate your posts Greg, especially since you have a pretty diversified
experience with heavy equipment.

That being said, did you really mean, "Check the output when output wire is
disconnected from bus batteries." ??

Without a battery or batteries to act as a load, I believe the rectifying
diodes would burn up in an instant. Greg's suggestion of lifting the
alternator output cable on both ends , checking continuity as well as
resistance to ground is a reasonable one. I have a friend who drives over
the road with a 60 series Detroit. He goes through alternators quicker than
he should and I wonder if it is simply the quality of the rebuilds that is
questionable as Greg suggested.

Donn
'76 FC33
South Kingstown, RI

From: WanderlodgeForum@yahoogroups.com
[mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of gregory O
Sent: Tuesday, October 13, 2009 9:12 PM
To: WanderlodgeForum@yahoogroups.com
Subject: [WanderlodgeForum] Re: Front Alternator 8V92

alternators require many working parts any one part that fails will not
allow it to work. when a bearing goes out it still pumps amps but the heat
can screw the windings and vr. if the prior rebuild didnt repair the bearing
or other cause for resulting failure replacing a burnt electrical component
will be short lived, like in your case. The other possibility is something
is burning out the electronics and replacing the alt will only prove that
point with a third failure.

Check the output when output wire is disconnected from bus batteries. I
would then take the alt to a good rebuilder.

one other test is to remove both ends of the charge wire, insulate the
battery end, then check for continuity with ground at the alt end. there
should be no continuity, if there is, 'continuous path' will show a ground
fault which will always demand amps.

You can usually find a referral of a local parts re builder from a local
salvage yard. WHen ever I am forced to buy a Pepboys reman alt or starter I
drop it off at my favorite rebuilder in Riverside Ca. they ship
http://riversidealternatorstarterac.com/
Greg of Tim&Greg
94ptca

--- In WanderlodgeForum@yahoogroups.com
, "SteveQ" wrote:
>
> I had the front alternator rebuilt in 2007 right after buying the coach,
and have about 25,000 miles +/- since then. After testing it today it is
dead again, there must be an underlying problem. Any ideas?
>
> Steve Quandt
> 1993 PT40
> Iron Mountain, MI