Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

3 pin alternator wiring for ej25


  • Please log in to reply
3 replies to this topic

#1 JasonPap2002

JasonPap2002

    New User

  • Members
  • Pip
  • 8 posts
  • Austin, Texas

Posted 05 September 2013 - 08:32 PM

Hey folks,

 

I have an ej25 out of a 1999 Forester in my 1984 Vanagon.  Runs great. Currently the alternator warning indicator lamp will not turn on. It hasn't worked since the conversion.  

 

 

One side of lamp is on ignition power, the other side goes directly to the alternator.  If ignition is on and I touch the other wire to ground (the side at the alternator), it lights up. However, if I touch the end to the "L" on the subaru alternator (pin1, closest to the B+) then it does not light.  L is not receiving 12 volts at this time but it's also not receiving ground - it's apparently open.

 

Try as I can I can't make the L have a ground, ever.  I've tried all combinations that I can think of.  I have pin 2 "S" in the connector wired directly to B+.   You can see the connector and two wires with B+ post to the right in this photo:

 

Attached File  photo.JPG   41.28K   26 downloads

 

And the wiring that I found:

Attached File  connector.jpg   4.33K   26 downloads

 

Here are the details:

  • With ignition off: L is not ground, S is not ground. 
  • With ignition on, but car not running: L is not ground, S is not ground. 
  • With ignition on, car running but L without 12 volts (field not excited), alternator  puts out 13 v.  S is at 0 volts. 
  • Once 12 volts is placed on L (say by touching the alternator warning lamp wire to it), the alternator puts out 15+ volts, and then S has .33 volts. 
     

My understanding is that with ignition on and alternator not spinning, then L should route to ground.  


If someone can confirm the actual wiring behavior they have I'd be much obliged. I'm almost starting to think it's something internal to the alternator but it appears to work fine otherwise.
 

Thanks folks!  I've learned a ton from this board.


Edited by JasonPap2002, 05 September 2013 - 08:34 PM.


#2 Gloyale

Gloyale

    It's a sickness

  • Members
  • 9,486 posts
  • Corvallis, OR PNW

Posted 07 September 2013 - 04:31 PM

L terminal should be ground when S recieves 12v alt not spinning (eng off)

 

Alt seems to be working but has fault on the L circuit.  Not grounding lamp and also spiking over 15 volts when excited means that the ALT has a problem in the voltage regulator inside.



#3 JasonPap2002

JasonPap2002

    New User

  • Members
  • Pip
  • 8 posts
  • Austin, Texas

Posted 08 September 2013 - 08:27 PM

L terminal should be ground when S recieves 12v alt not spinning (eng off)

 

Alt seems to be working but has fault on the L circuit.  Not grounding lamp and also spiking over 15 volts when excited means that the ALT has a problem in the voltage regulator inside.

 

Thanks!  I feel the same now, have done all sorts of tests this weekend.

 

Anyone have a recommendation as to the most cost effective place to buy a suby alternator?

 

Found on amazon $121 but not sure if I can go there.



#4 Mugs

Mugs

    Subaru Fanatic!

  • Members
  • 544 posts
  • Spokane & Hobart, Wa.

Posted 10 September 2013 - 11:46 PM

Pull and Save or equivalent in your area. 






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users