Right Blinker Doesn't Work Right ??? | FerrariChat
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Right Blinker Doesn't Work Right ???

Discussion in '308/328' started by Dr Tommy Cosgrove, Jul 5, 2010.

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  1. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    May 4, 2001
    36,592
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    Tommy
    #1 Dr Tommy Cosgrove, Jul 5, 2010
    I have now idea how long I have had this "problem" with my 84 308.

    Okay, 4 bulbs total behind the lenses on the front bumper.

    When I turn on my parking lights the smaller inner ones light up on both sides. The outer ones stay off.

    When I turn on the LEFT signal, the left outer light blinks

    When I turn on the RIGHT signal, the right INNER one blinks and the OUTER light stays OFF.

    (Basically, the right outer light never comes on)

    I noticed this when I was changing my light assemblies this weekend. Both assemblies are brand new (the old ones had corroded and the lights wouldn't stay on unless you tapped them) so the problem is behind them somewhere. Also, it was doing this BEFORE I put the new assemblies in.

    I even tried reversing the wires (those coming from the car) and the inner light STILL blinked. This was the really weird part becauseI confirmed the blinking wire with a test light.

    The new lense assemblies both have a blue wire on the outer lamp and a yellow wire on the inner lamp

    So how do I wire it so my turn signals work correctly on the right side?
     
  2. viper_driver

    viper_driver Formula Junior

    Jan 1, 2009
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    #2 viper_driver, Jul 5, 2010
    Where'd you find the front light assemblies? I need one of those and haven't had much luck finding one.

    Maybe the problem is that I just don't need it bad enough, one of mine has a small crack in it. Seems silly to pay $500 for a pair which is all I've been able to find.
     
  3. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    #3 Dr Tommy Cosgrove, Jul 5, 2010
    You are not going to believe this but I have absolutely no idea how I ended up with these things. I don't remember buying them or anything, in fact the only reason I was going so far as to replace them entirely is because I had them. I just found them digging thru a box of misc. parts a few weeks ago.

    Again, the problem isn't the new ones. It was doing it before I unpluged the old ones.
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #4 Steve Magnusson, Jul 5, 2010
    Last edited: Jul 5, 2010
    To deduce this, try unplugging the lamp assembly and measure the resistance between each of the three terminals on the lamp assembly when only having one of the bulbs in place. For example (assigning arbitrary names to the terminals)

    With only the inner bulb in place:
    terminal 1 to terminal 2 = infinite ohms
    terminal 2 to terminal 3 = a finite resistance (corresponding to the unheated resistance of the inner bulb filament)
    terminal 1 to terminal 3 = infinite ohms

    With only the outer bulb in place:
    terminal 1 to terminal 2 = a finite resistance (corresponding to the unheated resistance of the outer bulb filament)
    terminal 2 to terminal 3 = infinite ohms
    terminal 1 to terminal 3 = infinite ohms

    The common terminal where you get a finite (non-infinite) resistance in both tests (terminal 2 in this example) would be connected to the ground N black wire (of course, your names may be different). The other two you can just hook up randomly, and, if you need to swap them to match the LH side for inner vs outer, just swap them.
     
  5. Paul_308

    Paul_308 Formula 3

    Mar 12, 2004
    2,345
    #5 Paul_308, Jul 5, 2010
    Black wire is ground.

    Blue wire is the turn signal voltage.

    Yellow is parking and goes to sidemarker as well.

    For whatever reason, the euro qv 308s use different colors
    _______________________
    http://www.FerrariWiring.com
     
  6. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    #6 Dr Tommy Cosgrove, Jul 6, 2010
    but when I connect the blue wire to the turn signal in the assembly, the parking light blinks
     
  7. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #7 Steve Magnusson, Jul 6, 2010
    This can happen if you don't have the ground connected in the right place (or maybe if the intended ground is not really well connected to ground) and the two bulbs have different resistances (which I believe they do) -- i.e., if the two bulbs are (wrongly or effectively) connected in series, only the bulb with the higher resistance will illuminate strongly.

    Do you have a 3-pin connector (with three wires) as the schematic shows, or is the ground wire connected separately to the housing somehow?
     
  8. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    #8 Dr Tommy Cosgrove, Jul 6, 2010
    Three pin connector
     
  9. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #9 Steve Magnusson, Jul 6, 2010
    Can you try the resistance tests in post #4? If you have connection problems between the connector and what's inside the housing, you should see that in the results too.
     
  10. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    #10 Dr Tommy Cosgrove, Jul 6, 2010
    I am going to do that tonight. I'll let you know what I find out.

    Thanks!
     
  11. FasterIsBetter

    FasterIsBetter F1 Veteran

    Jul 22, 2004
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    #11 FasterIsBetter, Jul 6, 2010
    Blinker fluid is low.... (My apologies -- couldn't resist... speaking of resistance testing...)
     
  12. Birdman

    Birdman F1 Veteran

    Jun 20, 2003
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    #12 Birdman, Jul 6, 2010
    Definitely check the ground!
     
  13. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #13 Steve Magnusson, Jul 16, 2010
    Tommy -- anything new?
     

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