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
- - - - -

My BRAT's Got Rhythm?


  • Please log in to reply
8 replies to this topic

#1 Seahag1978

Seahag1978

    1000+ Super USER!

  • Members
  • 1,387 posts
  • Witch City

Posted 06 September 2006 - 08:02 PM

I stopped at a stop light this afternoon and my tach was keeping perfect beat to the music on the radio. It's mostly rising and falling with the vocals, right down to the syllables as they are sung. It's pretty funny... acts just like an equalizer.

I only does it when I'm stopped with my foot on the brake, the engine rpms stay constant. Is it just happy, or did a ground go astray somewhere?

#2 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 20,280 posts
  • Portland

Posted 06 September 2006 - 08:07 PM

Interesting - have a look under the disty cap and see if there is any play in the shaft. Jumpy tach can be from the shaft bearings getting sloppy.

Might be the alternator too so check alt output and verify there isn't any AC comming from it.

GD

#3 Seahag1978

Seahag1978

    1000+ Super USER!

  • Members
  • 1,387 posts
  • Witch City

Posted 06 September 2006 - 08:24 PM

Might be the alternator too so check alt output and verify there isn't any AC comming from it.

GD


The little gauge that shows me the volts stays constant on 12. How do I check the alternator for AC?

#4 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 20,280 posts
  • Portland

Posted 06 September 2006 - 10:09 PM

Do you have a multi-meter? If not, you can probably stop by an Autozone or the like and have them check your alt for free.

If you do, set it for Alternating Current, and test across the battery, or off the back of the alternator and to ground. There should be no AC output.

Harbor Frieght usually has digital multi-meters for about $5. Very usefull for an older subaru owner. :)

GD

#5 baccaruda

baccaruda

    YOUR FAVORITE MOD

  • Moderator
  • 6,942 posts
  • SpoVegas, WA

Posted 06 September 2006 - 11:29 PM

I would suggest that you inspect and augment the major grounding points on your car. Also consider splicing into the radio's ground and instead of letting it ground through the harness, consider running a shorter ground driectly to the chassis somewhere...
When I have my cigarette-lighter cell phone charger plugged in, my radio is more staticky. I could ground the cigarette lighter more heavily and probably end that.

#6 Turbone

Turbone

    The Original Rob

  • Moderator
  • 12,128 posts
  • WA

Posted 07 September 2006 - 12:51 AM

I say, crank up the radio and see if the tach jump higher!:headbang:

Of course, following the above tips would be a good idea also

#7 jeffast

jeffast

    f*** im 24

  • Members
  • 2,029 posts
  • midwestren

Posted 07 September 2006 - 12:55 AM

sounds like grounds to me but i also like turbone's suggestion:headbang:

#8 daeron

daeron

    Cunning Linguist

  • Members
  • 3,600 posts
  • West Palm Beach

Posted 07 September 2006 - 05:30 AM

what does it mean when you get AC voltage out of your alt?

#9 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 20,280 posts
  • Portland

Posted 07 September 2006 - 06:27 AM

Bad rectifier in the voltage regulator.

GD




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users