355 battery light conundrum | Page 2 | FerrariChat

355 battery light conundrum

Discussion in '348/355' started by Jpwulf, May 20, 2024.

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  1. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    14,534
    Sydney
    Full Name:
    Ian Riddell
    The 355 has the same as the later 348's (with a 12 pin plug)... and it's behind the strut. The 348 old plug seems to be in front of the strut. I'm not sure about the newer 348 plug.
     
  2. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
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    Ian Riddell
  3. spaghetti_jet

    spaghetti_jet Formula Junior

    Jan 5, 2005
    949
    Europa
    Full Name:
    Bob
    If you pull the green plug out of the alternator and drop the wire down it shouldn’t be too difficult to work on. You pull back the outer protection tubing to get access to the actual wires.
     
  4. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
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    Ian Riddell
    On my car, the thermofit type "outer protection" was very short, then the protection became solid rubber with the wires twisted inside. Something like this:

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    It was impossible to gauge how deep to cut into the insulation and the insulation wouldn't peel away easily.
     
  5. spaghetti_jet

    spaghetti_jet Formula Junior

    Jan 5, 2005
    949
    Europa
    Full Name:
    Bob
    oh wow, that is very different to my car. If I remember correctly you don't have the round connector on your alternator?
     
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  6. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
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    Ian Riddell
    It’s been so long since I looked at it, I’m not sure. It may be a flat plug with the pins in a row. It’s definitely a Nippon Denso. I thought it might have been normal in later cars as the harness didn’t show any signs of splicing or modification. Anyway, the used harness I bought had a round plug, so I thought I’d better fit a new alternator with a round plug instead of messing around with adapters. Less joins, less resistance.
     
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  7. Jpwulf

    Jpwulf Karting

    Sep 26, 2022
    81
    Oregon
    Full Name:
    John Wulf
    Well I finally got the car up in the air to see what I could find. Pulled the 3 wire plug out from the back of the alternator and noticed some electrical tape wrapped around the wires, so removed the tape to see if maybe it was replaced prior or why they were taped. Noticed two of the wire coatings were melted. Got a new plug, and spliced it in, and the battery light hasn’t come back on since!

    Just frustrated that the shop I continued to take the car to for fixing the issues either never checked the wires, or just wrapped them and crossed their fingers.

    Also upgraded the ground wire to be safe.
     
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