Results 1 to 4 of 4

Thread: 1999 legacy gt weird idle voltage

  1. #1
    New User
    Join Date
    May 2017
    Posts
    24
    Points
    137
    Level
    2
    Points: 137, Level: 2
    Level completed: 74%, Points required for next Level: 13
    Achievements:
    7 days registered100 Experience Points

    1999 legacy gt weird idle voltage

    Hello. I have a 1999 Subaru Legacy gt 5mt and when the car returns to idle at stop lights and what not there is a very noticeable dimming of all the lights on the car. No ligh turn on on the dash but after checking the voltage of the battery the altonator only puts out 13.0 volts at idle. Once’s the engine leaves idle the voltage returns to 14.0 volts. I have a new altonator so I’m wondering if this is normal or if the altonator is going out again. From what I’ve read it could also be a bad ground but I have no idea where to check for that. Some help would be greatly appreciated.

  2. #2
    SLi Lurker Sub-Goon's Avatar
    Join Date
    Feb 2013
    Location
    Oakland, CA
    Posts
    409
    Points
    2,599
    Level
    30
    Points: 2,599, Level: 30
    Level completed: 99%, Points required for next Level: 1
    Achievements:
    1 year registered1000 Experience Points
    Look for any ground connection between the engine/trans and body. Clean off all oil/grease, scuff all the components with sandpaper or wire brush. As you reassemble the connections, use Dielectric Grease. You could also replace any OEM grounds with 4 gauge welding wire & eyelets from Home Depot or Stereo Install shop.

    If that doesnt get the alternator output a bit higher then pull the alternator and take it to an Auto Electric shop to have them check it out.

  3. #3
    New User Kamion's Avatar
    Join Date
    Aug 2016
    Location
    Slovenia
    Posts
    19
    Points
    708
    Level
    14
    Points: 708, Level: 14
    Level completed: 8%, Points required for next Level: 92
    Achievements:
    3 months registered500 Experience Points
    13 V at idle is completely normal.
    Subaru Legacy GL EJ20 (BH, year 2002)

  4. #4
    New User
    Join Date
    May 2017
    Posts
    24
    Points
    137
    Level
    2
    Points: 137, Level: 2
    Level completed: 74%, Points required for next Level: 13
    Achievements:
    7 days registered100 Experience Points
    Is it normal for the lights to dim at idle?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •