Testarossa Electrical Diagram Needed | FerrariChat

Testarossa Electrical Diagram Needed

Discussion in 'Technical Q&A' started by fastrt10, Oct 11, 2006.

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  1. fastrt10

    fastrt10 Rookie

    Aug 21, 2004
    6
    Charlotte, N.C.
    Full Name:
    Edward Bowers
    Does anyone have a copy of the electrical schematics for a 1991 Testarossa?
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,932
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    1. What version? -- US, CH, standard (euro), etc.?

    2. What topic? -- starting/charging, igniton, injection, ext lights, AC, etc...

    3. Why? ;)
     
  3. fastrt10

    fastrt10 Rookie

    Aug 21, 2004
    6
    Charlotte, N.C.
    Full Name:
    Edward Bowers
    It's a 1991 U.S. Version Testarossa. I have a short in the dash lights and also an electrical starting problem both of which need to be traced.

    Thanks.
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,932
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    OK, but can you be a little more specific about the problems:

    For the "short in the dash lights" -- can you confirm that you are always blowing fuse #13 when you turn on the running lights (or please give which fuse #)? If it is fuse #13, a first stab would be to try unplugging the G (yellow) wire at the base of the engine bonnet gas lift spring that feeds the license plate lights -- I forget which side it's on, but on one gas spring the wire at the bottom is yellow (for the license plate lights in the engine lid), and the other gas spring has a red wire (that feeds the CHMSL in the engine lid). If the fuse doesn't blow with that G wire unplugged, it indicates the problem is the gas spring itself or something downstream.

    For the "starting problem" -- if the symptom is that you sometimes get absolutely nothing when warm (i.e., the starter solenoid does not fire at all when the warm), do a search on "TR solenoid ace electric" (here and at the old site too) to get a lot of prior discussion/options. If the B (white) start command wire at the solenoid goes to about +8V (or better) with the key in the start position, but the solenoid doesn't fire, I'd get a new WAI solenoid.

    Send me a PM with your email address (and confirm which fuse# you are blowing plus whatever else you'd like to add here), and I'll email some relevant scans in .tif format tomorrow (the lettering is really small so each scan is a fairly large ~2MB file).
     
  5. Flyyellow

    Flyyellow Rookie

    Mar 12, 2005
    3
    Oregon
    Full Name:
    glenn e wickstrom
    I have for a 1985 testarossa
     

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