Re: [MV] M35 charging problem

Morning Bill,
I can't tell you about the alternator/regulator, but the dc-generator has a
separate regulator on the firewall on the driver's side. The black/od box
with cooling fins most likely.
That regulator limits its output current automatically so there is no fuse
or breaker between it and the battery.
Your bat/gen indicator on the dash monitors the battery voltage. If it
doesn't show 28 volts when the engine rpm is 800 or above then there is a
problem with the regulator or generator. Most probable, the regulator, which
has little protection from high voltage spikes that may occur if it happens
to be charging and the battery connections come loose ("load dump"
transients). Also if there is a problem with the connection between the
regulator and generator, the control transistor in the regulator may "blow".
But then again, if you have the 60 amp alternator, I can't help you much at
this time.

As a note, I added "load dump" protection to my regulator by installing
heavy duty varistors and replaced the original control transistor with a
higher current one plus an external micro fuse (MVM Feb 2004 article). Did
this after the regulator failed because of a shorted wire between it and the
generator. Has been working well for a couple of years now.

Hope this helps in some way.
Bjorn





[color=blue]
>From: "Bill Kealey" <cwkealey@atlanticbb.net>
>To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>Subject: [MV] M35 charging problem
>Date: Fri, 14 Jan 2005 23:42:44 -0500
>
>I spent much of the day opening ADOBE documents on disk in reference to
>problems with the charging system of my truck. Actually only one known
>problem, it dosen't want to charge the batteries. I have cleaned and
>tightened the battery terminals and related connections all looks okay
>there. Both batteries are okay also and fairly new.
>
>I am hoping that the generator or alternator, can't remember which I have
>and the books say it could be either is okay along with the voltage
>regulator.
>
>My real hope is that there is a circuit breaker/fuse there somewhere which
>is the problem. Haven't found one in the books yet that would be the
>problem.
>
>All of the lights work properly also. And, I have removed the dash panel
>and all of the connections seem to be tight and clean. Everything else in
>there is covered with an inch or so of dust, but the connections look good.
>
>Anybody have any ideas as to where a fuse or circuit breaker or fuseable
>link would be located that would affect the gen/alt output?
>
>As always, any help is appreciated.
>
>Bill Kealey
>MVPA 24623
>1954 USMC M38A1
>1972 USA M35A2 w/winch n/Turbo
>1985 USAF M105A2
>
>
>
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