Ferrari 365/400/412 "Sleepy" Headlight | FerrariChat
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Ferrari 365/400/412 "Sleepy" Headlight

Discussion in '365 GT4 2+2/400/412' started by 360modena2003, Oct 8, 2025.

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  1. 360modena2003

    360modena2003 Formula 3

    Jul 11, 2009
    2,472
    #1 360modena2003, Oct 8, 2025
    Hello,

    I am starting to use the 412 as a "daily", and this has happened to me a few times.

    It is an intermittent issue, which makes the diagnosis a bit more challenging.

    I was able to use the manual knob underneath the rubber cover, but I would like to get this repaired.

    I recall reading that the issue could be with the "tracks" of the closing mechanism?

    Has anyone had this issue and knows how it has to be addressed?
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  2. raemin

    raemin Formula 3

    Jan 16, 2007
    2,416
    Lyon (FR)
    Full Name:
    R. Emin
    #2 raemin, Oct 8, 2025
  3. theunissenguido

    theunissenguido F1 Rookie
    Owner Silver Subscribed

    Jan 21, 2004
    2,780
    Argent/Brasil
    Full Name:
    Guido
    #3 theunissenguido, Oct 8, 2025
    This can be related to the relays...swap the light relays with other ones of your fuse board.
     
    Alden likes this.
  4. 360modena2003

    360modena2003 Formula 3

    Jul 11, 2009
    2,472
    #4 360modena2003, Oct 8, 2025
    Thank you - will take a look.
     
  5. Alden

    Alden F1 Rookie
    Rossa Subscribed

    Apr 25, 2010
    3,794
    Central Florida
    #5 Alden, Nov 4, 2025 at 5:49 AM
    Take Guido's advice and replace the relays before you do anything else. These types of problems are almost always related to the relays, go there first. It's easy and cheap.
    Alden
     
  6. raemin

    raemin Formula 3

    Jan 16, 2007
    2,416
    Lyon (FR)
    Full Name:
    R. Emin
    #6 raemin, Nov 4, 2025 at 3:12 PM
    Yes could be, but "incidental": the stock relay coil does consume 200mah, so the lifting motor track and diodes have to be in pretty good shape in order to provide enough juice just to trigger the relay coil. The new bosch relay (plastic case) is less power hungry so can make it do with a less conductive feedback mechanism.

    This being said, it's easy to swap the right and left relay (as long as you remove all the floor and quite some bits of leather trim to access the panel...)
     

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