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90 Mustang GT voltage/wiring troubles?

5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

90 Mustang GT voltage/wiring troubles?

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Old 11-05-2008, 09:36 AM
  #11  
PRO50SC
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Are you still running the stock alt or have you gone to the 3g?
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Old 11-05-2008, 10:45 AM
  #12  
ButkusJr
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stock...i was using the same setup that was on the car before i was messing with the heater core
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Old 11-08-2008, 11:44 PM
  #13  
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sorry for the quality of the pics...all i have is my phone for pictures....


i was wondering what these two wires were on the left side of the steering column behind the dash...they are black with a white tracer

http://c2.ac-images.myspacecdn.com/i...ec66c5f3f1.jpg

http://c3.ac-images.myspacecdn.com/i...a0a0914df6.jpg

http://c3.ac-images.myspacecdn.com/i...a7844af942.jpg


i also was wondering if anyone knew what this was? it is behind where the radio would be and i am thinking of a slight chance antifreeze leaked into/onto it?

http://c1.ac-images.myspacecdn.com/i...5120ba67e4ce98

http://c2.ac-images.myspacecdn.com/i...dbf5e1ac71.jpg

http://c2.ac-images.myspacecdn.com/i...83bc3fd471.jpg

http://c4.ac-images.myspacecdn.com/i...ed42cb2183.jpg

Last edited by ButkusJr; 11-09-2008 at 11:41 AM.
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Old 11-09-2008, 06:45 AM
  #14  
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OK, posting links to my space doesn't work. You have to be a member to view the pics.

Open a www.photobucket.com account for hosting pictures.
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Old 11-09-2008, 11:42 AM
  #15  
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there...they should work now....
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Old 11-13-2008, 10:37 PM
  #16  
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i have not fixed it yet...i am looking at everythign again...grounds seem ok and clean...dash is out again and no bad wires or anything, no metal/wire connections causing shorts, altenator is fine, battery fine, all wires at coil stuff tested fine, fusable links tested fine, checked all fuses...fine...i just cant figure the darn thing out!
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Old 11-24-2008, 09:59 PM
  #17  
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also adding that now that i have changed the battery in my multimeter (it was reading voltage like crap cause of bad/dieing battery) the car runs around 11.85ish to 12.40ish volts...low end with lights on and high end with no load what-so-ever
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Old 11-24-2008, 10:21 PM
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my voltage is the same. around 13.5ish. and yes when you turn on the flashers the battery gauge jumps each time the flash as well as when you turn on the ac/heater. i wouldn't worry about it. Do you have u/d pullies on it? find the draw so you can eliminate that and you should be fine.
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Old 11-25-2008, 12:08 AM
  #19  
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Originally Posted by ButkusJr View Post
also adding that now that i have changed the battery in my multimeter (it was reading voltage like crap cause of bad/dieing battery) the car runs around 11.85ish to 12.40ish volts...low end with lights on and high end with no load what-so-ever
i realized the flashers thing when i looked at it on my truck too...

but i have no idea now what to do for that draw...i've tried everything i could think of and nothing

and no, i don't have underdrives...its stock motor and everythin
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Old 11-25-2008, 01:10 AM
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if it goes up to high 13's when you accelerate/charging, i wouldn't worry about it. believe me i am in the same boat. i tried and could not find anything wrong. people here say it should be in the 14's at idle and never could get mine that high. its been a while since i checked mine but i would say mine flucuates between 12.8-13.4. it usaully starts high than levels off at 12.8ish

things i did just in case

upgraded to the 3g alt. from 95 cobra or something, i can't remember
ran new 4g wire from alt to solenoid.

to find the draw

disconnect the positive terminal and clamp on a test light to the term. then touch the pos post. the light should come on and is probably bright. get a friend to pull fuses while you watch the light. there should be a slight dim in the light for the computer and the radio clock/settings but thats it.

i found which fuse has my draw and when i know i'm not gonna drive the car for awhile i pull that fuse, so it doesn't drain. my draw is the alarm and i'm not that prone to pulling that crap out of the car just yet. hope this helps
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