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
- - - - -

alternator?


  • Please log in to reply
8 replies to this topic

#1 myfinalcoffinx

myfinalcoffinx

    Eat, Live, Breath Subaru

  • Members
  • 259 posts
  • SF

Posted 10 November 2005 - 04:46 AM

at low RPM, all of my lights dim and fans slow down. is this likely a problem with my alternator or a problem with my battery?

#2 TomRhere

TomRhere

    Certified BRAT nut!!!

  • Members
  • 3,956 posts
  • Hillsdale, Mi. USA

Posted 10 November 2005 - 05:38 AM

Could be either, really. But if the battery is say over 5 years old, it could be on it's way out. Would do some checking and cleaning of alt connections, battery cables, (both ends), and clean all of the ground wires in the engine area.

#3 nipper

nipper

    Semi Elite Master of the

  • Members
  • 17,541 posts
  • Long Island NY

Posted 10 November 2005 - 08:03 AM

Gte a free battery/alt output test. I agree about the battery being over 5 years old replace it, but it sounds a bit more like an alt problem.


nipper

#4 Mark Humble

Mark Humble

    USMB Regular

  • Members
  • PipPipPip
  • 119 posts
  • Lewiston Ca.

Posted 10 November 2005 - 11:24 AM

If you have a volt meter you can check the voltage output at the alt to see what it is putting out. Should put out about 13.5 at an idle (min.). Another tool that can be very helpful is a inductive amp gauge to see what the amp output is. The auto parts store should at least be able to order one for you. They are relatively cheep. If the tests show the volts down but the amps up then it could be a battery.

#5 calebz

calebz

    Andys Coupe killed my cat

  • Administrator
  • 7,547 posts
  • Tacoma

Posted 10 November 2005 - 11:28 AM

COUld also be an old, slipping belt. Check the belt to see if its mangled/cracked/etc

#6 Sweet82

Sweet82

    Elite Master of the Subaru

  • Members
  • 3,266 posts
  • Salt Lake City

Posted 10 November 2005 - 11:38 AM

The alternator is only hanging on with two bolts,

Undo two bolts and remove the alternator. Take it to any auto parts store and ask them to test it.

It's a 5 minute project.
Glenn,
82 SubaruHummer--new alternator
84 GL--new used alternator
01 Forester--factory alternator

#7 northguy

northguy

    O.C.A.L. Life Member

  • Members
  • 4,352 posts
  • Chugiak, AK

Posted 10 November 2005 - 11:55 AM

Try buying a $2 can of belt dressing and see if it's your fan belt slipping. If so, tighten the fan belt and wheel on.

#8 azsubaru

azsubaru

    Subaru Fanatic!

  • Members
  • 451 posts
  • Phoenix, AZ

Posted 10 November 2005 - 12:06 PM

Bet it's the battery.

#9 myfinalcoffinx

myfinalcoffinx

    Eat, Live, Breath Subaru

  • Members
  • 259 posts
  • SF

Posted 02 December 2005 - 08:11 PM

Turns out that the alternator belt was slipping.

Thanks guys.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users