Mystery electrical plug behind the front grill ? | FerrariChat
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Mystery electrical plug behind the front grill ?

Discussion in 'Boxers/TR/M' started by boxertt, Jul 12, 2025.

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  1. boxertt

    boxertt Rookie
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    Stefan
    #1 boxertt, Jul 12, 2025
    Heya folks,

    Refilling the washer fluid a couple of times on the trip, I noticed that there is an unused electrical connector next to the horns in the center of the nose. A quick glance doesn't show anything that would it would plug into, all my lights/horns/windshield wipers/etc work as expected. I looked at the diagrams for the electrical system, and there's nothing listed in the nose.

    So now I'm wondering, is this perhaps for a secret experimental active aerodynamic system ? Or maybe for the front lift system that I've wished for quite a few times on my recent trip ? I didn't yet check with a multimeter if/when there's power to it.

    Photos attached, it looks dirty and gunky enough that it hasn't been used in ages, and proof that someone at least once sprayed some paint around it ;-) Image Unavailable, Please Login Image Unavailable, Please Login
     
  2. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #2 Rifledriver, Jul 12, 2025
    Neither your profile page nor this post gives us any clue what version Boxer you might be talking about and combined with no color codes it pretty much makes it impossible to look up. If you are really interested a little information would be a big help.
     
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  3. boxertt

    boxertt Rookie
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    #3 boxertt, Jul 12, 2025
    Last edited: Jul 12, 2025
    Sorry Brian, of course you are correct, let me quickly add the info here, and will update my profile momentarily.

    It's a Swiss 1987 Testarossa, Rosso Corsa Fer 300 / 9. According to red-headed.com it's an F113A040 engine, Bosch KE Jetronic if that makes a difference.
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #4 Steve Magnusson, Jul 12, 2025
    Last edited: Jul 12, 2025
    The best clue that you can give is the insulation colors of the two wires that can then be compared to insulation colors shown on the wiring diagram (although a wiring diagram for a different version might not show it -- and a CH version TR may have a "special" wiring diagram). It certainly looks "stock" F. Do you have front fog lights that already have wiring?

    Also, in that time frame, IIRC, the UK (GB) version had a DIM-DIP requirement for the front headlights to provide more exterior lighting than just the parking lights (sidelights) but less light than the low (dipped) beams would normally provide. Might be related to that if they did a common wiring harness to use in multiple versions.
     
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  5. turbo-joe

    turbo-joe F1 Veteran

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    romano schwabel
    #5 turbo-joe, Jul 12, 2025
    may be you have the same plug on the other side? then I would say this is for the US market for the front side markers?
    you may check when there is power
     
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  6. boxertt

    boxertt Rookie
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    #6 boxertt, Jul 13, 2025
    I haven't yet had the chance to grab the multimeter yet, but I took another look and a couple more photos.

    The wire colours are gray and gray with a black stripe. I could only find this one connector, I don't see a second one. I have the standard fog (which I can flash) and parking lights/blinkers.
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  7. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #7 Steve Magnusson, Jul 13, 2025
    I don't see any 2-pin connector in that area with a H (grey) and HN (grey-black) wire on the TR wiring diagrams that I have, but I don't have a TR wiring diagram with the DIM-DIP function. Hopefully someone with a GB version TR and DIM-DIP can check their TR for comparison.

    I will say that H (grey) is the wire color on the TR wiring schematics for running the low beams. Wouldn't be a definitive test (as there may be other components/other wiring harnesses that they leave out on non DIM-DIP equipped TR), but if that H wire goes +12V when you have the low beams "on" (i.e., the H wire is connected to the low beams) = a clue it might be related to DIM-DIP.
     
  8. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #8 Rifledriver, Jul 13, 2025
    Same with Steve. All my diagrams are for US model. The only connector I find with 2 wires of that color is for the sound system. I strongly suspect that wire branch will not run that far. There were some specific differences with the Swiss version. I know the 328 had headlight washers. Have no idea if those were incorporated on Swiss TRs.
     
  9. lagunacc

    lagunacc F1 Rookie
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    #9 lagunacc, Jul 13, 2025
    Swedish TR's
     

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