Hyster S30A:
Need alternator and some infos...

Hi there... First post for me here.... Did some searching and did not find my answer.... Hopefully someone can chime in...

We have an 1978 Hyster S30A which the alternator has decided to charge then not charge twice every second.... When we put the volmeter on it, we clearly see 14v-0v-14v-12v-4v-0v- etc... very fast... So naturally I Started my search for an alternator... But I have been running into an issue where I can't find anything for a S30A..... but I can find a few for an S30.... Does someone knows what the A means and if it is important in my search for an alty ? I guess I could dismantle the alternator in order to find a part number or something but since this forklift is in use pretty much all day I would have preferred to find the new part and only take it apart once....

Can someone help a bit here ?

Tks alot
  • Posted 4 Jul 2012 10:10
  • Discussion started by fleurys
  • Quebec, Canada
Showing items 1 - 7 of 7 results.
Well, the problem is fixed and it did not had anything to do with the points or rectifier.... There was 2 issues...

1) the voltmeter that we used was defect. It was jumping around from 0 to 12, and like someone told me, it made no sense since if the alternator was to be bad, the voltage would go from 14 to 12..not zero.... or else the battery would also be shorted...

So after testing the battery (which was good), we used another voltmeter and found out that there was simply no charging from the alternator.. but at least the voltage was steady..around 12v...

2) At that point we were sure that when the new rectifier and points would come in by mail, that we would fix the problem.... In the mean time, my co worker found a wire underneath the key-lock that was disconnected... he reconnected it and now the battery was getting charged.... So it's obviously an important wire that somehow must send a signal to the alternator to charge or something... just not sure... but the problem is gone and my good ol buddy is back in action....

Just wanted everyone to know about my experience.


  • Posted 19 Jul 2012 10:46
  • Reply by fleurys
  • Quebec, Canada
yes.. It is written on the lift.

Here`s the serial : A010D14907Y
  • Posted 6 Jul 2012 01:56
  • Reply by fleurys
  • Quebec, Canada
after doing some checking
are you sure about the model?
is it not an S300A?
in the smaller weight class trucks all i can find is an S30C

got a serial number?
  • Posted 5 Jul 2012 20:51
  • Reply by Jplayer
  • North Carolina, United States
John Player Jr
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net
yeah, well, this was my first move before writing here, and the dealer told me....(drum roll)... 660$.... I asked him if the alternator was gold plated ! :-)

So much for this option.... As of now, I have ordered a points rebuild kit with a regulator....for a total of 15$ plus shipping. I will definitely try this route first and go from there... I will inform everyone the results of this fix once I receive/install the new points and regulator...
  • Posted 5 Jul 2012 11:29
  • Reply by fleurys
  • Quebec, Canada
TVH part number
drop the hy and contact whoever is the hyster dealer near you and you will have it
  • Posted 4 Jul 2012 14:45
  • Reply by VAN_CEN
  • British Columbia, Canada
nah, I don't think so.... I'm pretty sure I remember seeing a 2 pin male connector on the side. After looking a bit at Delco remy documentation it seems more and more to be a 12SI model... Which has a internal regulator (System Integrated)...

I'll confirm tomorrow, but it seems I may be able to get away with a GM alternator (like you said), that was used between 1975-1985...

To answer your question, yes the battery eventually drains down when the liftruck is being used alot.... Seems the more it is used, the more the battery gets taxed since the alty do not charge it enough... It is worst if it is used many short times during the week... not so much is it is used on long period (I guess the battery takes just enough charge to hold a bit more like this...?)
  • Posted 4 Jul 2012 11:48
  • Reply by fleurys
  • Quebec, Canada
Does that have a voltage regulator mounted right on the underside of engine cover that you flip up to access the motor? If so, it probably is a old mechanical type with points and that probably is causing the voltage to jump all over the place. That is a Delco system like they used in GM cars back then and you should be able get parts at a auto parts store.

P.S. Is the battery running down? Are you measuring the voltage at the battery?
  • Posted 4 Jul 2012 10:48
  • Modified 4 Jul 2012 10:53 by poster
  • Reply by mrfixit
  • New York, United States

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