Turn signal always illuminated when headlights on | Page 7 | FerrariChat
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Turn signal always illuminated when headlights on

Discussion in '348/355' started by chris marsh, Aug 10, 2023.

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  1. m.stojanovic

    m.stojanovic F1 Rookie
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    Miroljub Stojanovic
    #151 m.stojanovic, Oct 12, 2023
    Yes, you just pull it out. While pulling, the rectangular push button may come off the switch body (it is clip-on) before the switch unplugs. If this happens, just clip it back on and pull again slowly with some left-right wiggle.
     
  2. chris marsh

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    #152 chris marsh, Nov 12, 2023
    Last edited: Nov 12, 2023
    HOLY CRAP. Maybe it is not fixed after all.

    Went to install the headlight assemblies I bought. Turns out they weren't correct. So, I cleaned up my old ones.

    Took the car for a drive tonight to see how the headlights looked.

    Now blowing the 10 amp fuse for instrument lights.

    I got out of the car to check to see if I had taillights. That right side yellow light was on again. As I was standing there looking at it, it went off.

    Drove home and left the car running. The yellow was not on. I turned the lights of but put the stalk on the first position. The right rear yellow light came on again but left front yellow light was not on.

    My first concern: why is the fuse blowing for instrument lights I did not mess with them at all?
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  3. Qavion

    Qavion F1 World Champ
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    #153 Qavion, Nov 12, 2023
    Fuse 10? (powers HVAC ECU and instrument dimmer). I'm not sure how you'd isolate a problem with the instrument lighting system. It could be caused by literally dozens of different things. You would have to push pins out of relay panel plugs to divide the circuit into zones (or cut wires and install quick disconnects).

    Is it related to your original problem... seems unlikely. You still seem to have a short somewhere, affecting the external lights. Have your solder joints failed in the front light assembly?
     
  4. chris marsh

    chris marsh F1 Veteran
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    #154 chris marsh, Nov 12, 2023
    Isn't the instrument panel completely separate from external lights.

    My thought are a short or defect in the steering column light switch. Doesn't that tie everything together?
     
  5. Qavion

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    #155 Qavion, Nov 12, 2023
    The column switch activates relay "b". Relay b has two sets of contacts. One set powers the HVAC ECU and dimmer (via fuse 10), the other set powers the external lights (via fuse 11 & 12). A short in one branch is not going to perceptibly affect the other branch (especially so after one branch's fuse has blown). A short in one branch would have to exceed the capacity of the battery/alternator before the other branch would be affected. The fuses and wiring would melt long before this.
     
  6. chris marsh

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    #156 chris marsh, Nov 13, 2023
    So,you're saying i'm pretty much screwed?

    The day I bought the car I drve it 500 miles did not have nay issue with instrument lights. What the heck?
     
  7. chris marsh

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    #157 chris marsh, Nov 13, 2023
    I was just thinking, I did wash the car...LOL.


    This is very depressing. I thought I had it fixed.
     
  8. chris marsh

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    #158 chris marsh, Nov 13, 2023
  9. Qavion

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    #159 Qavion, Nov 13, 2023
    According to the WSM, yes.

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    Regarding the instrument lights, yes, somewhat screwed. I can't see how washing the car would blow a fuse, however, even if water got inside the cabin.
    For the sidelights, recheck your front lamp assembly wiring/soldering.
     
  10. chris marsh

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    #160 chris marsh, Nov 13, 2023
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  11. Qavion

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    #161 Qavion, Nov 13, 2023
    Strange. All 3 manuals I have show that fuse labelled as #10. Can you take a photo of your manual for future reference?
     
  12. chris marsh

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    #162 chris marsh, Nov 13, 2023
    I can e mail you a copy of my Manual if you'd like.

    Well, I got home tonight, stopped and bought some 10 amp fuses, you know, they had a 25 pack. I thought I might need a few.

    Put one in and it did not blow. I left all the lights on 30 minutes and it did not blow, but the right rear yellow light was on just like my original problem.

    So I decided to disconnect the front turn signal assembly and the rear yellow light went out.

    There is a one in a million chance that my earlier repair had the spring that holds the bulb was shorting.

    I put some electrical tape in there and everything is functioning fine again.

    Huh?

    This is driving me nuts!
     
  13. Acguy

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    #163 Acguy, Jan 11, 2025
    How are your lights working?
    I’m having similar issues I’m down to sockets or bulbs.
     
  14. chris marsh

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    #164 chris marsh, Jan 11, 2025
    Mine are fixed. Traced to a blue wire connected to a yellow wire in the front turn sgnal. I truly believe this car may have come out of the factory like this.

    Juding by the condition of the screw heads on the rear rail lights, this has been taken apart many times.
    I believe i had posted pics in this thread.
    For bulbs and sockets i recomend Rock Auto. GM compatible.
     
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  15. chris marsh

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    #165 chris marsh, Jan 11, 2025
    See above post
     
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