Turn Signals And Brake Lights Not Working | FerrariChat

Turn Signals And Brake Lights Not Working

Discussion in '308/328' started by Dr Tommy Cosgrove, Oct 30, 2014.

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  1. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
    Owner Rossa Subscribed

    May 4, 2001
    36,236
    Birmingham, AL
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    Tommy
    For some reason the turn signals on all four cornors and both brake lights are not working on my 84 308.

    The Hazards blink as they are supposed to (so the bulbs are fine) and all the other lights come on everywhere else but when I turn on the key and use the turn signal, nothing. The blinker doesn't even blink on the speedometer. Nothing when I push the brake pedal (I noticed this when I was backing down the driveway so they both don't work when the car is running.

    No fuses are blown.

    The only "odd" thing I have screwed around with was pulling the left rear panel off to R&R my fuse protection relay on the F.I. but I am not 100% sure everything was working before that, I am just assuming they did.

    Any ideas before I start digging around in there this weekend? I just don't get any association between the brake lights and the four turn signals.
     
  2. ME308

    ME308 Formula 3

    Nov 5, 2003
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    Michael
    do wipers, wishwasher pump, rad fans and window motors work ?

    if no, check/change fuse one (first left-) in the left fuse box once again
     
  3. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    I didn't try anything else.

    I carefully triple checked the fuses, but only visually. They are glass so I can see the filament. I'll run through them with a meter for continuity this afternoon and check the other accessories as well.

    If all that checks out... What the hell?
     
  4. AaronMeisner

    AaronMeisner Formula Junior

    Jul 15, 2014
    267
    Baltimore MD USA
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    Aaron Meisner
    When my signals stop working, I always start by jiggling the emergency flasher switch. So far it's solved the problem.

    I don't know if it is in any way helpful for the brake lights.

    Good luck.
     
  5. MikeRSR

    MikeRSR Formula Junior

    Jun 22, 2009
    476
    Surrey, England
    When brake lights not working on the Vetro, it's because I've knocked of the wire on the switch unit above the pedal with my big feet!
     
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    Even though fuse #1 may not be blown, the problem can be the fuseblock itself (i.e., +12V going to the top of fuse #1 gets there via the rivets/plates/metal bits at the top/back of the fuseblock) -- it's about the only thing that can singlehandedly take out both the turn signals and the brake lights at the same time so I'm betting with Michael's hunch that that's the trouble area. Measure the voltage at the top of fuse #1 (relative to ground) with the key "on" and the brake pedal depressed = if it's not +12V = that's the problem. If it is +12V, make the same measurement at the bottom of fuse #1 = if that's also +12V, but those things still don't work, call a witch doctor ;) Good Hunting!
     
  7. ME308

    ME308 Formula 3

    Nov 5, 2003
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    Michael

    both suggestions would be thinkable ... but only if the doctor had two separate problems at the same time aka the brake lights have not been working for some time and the indicator failure would have appeared as an additional problem just recently

    other than power flow via fuse 1, there is no connection between brake lights and indicator lights

    waiting for Tommy`s feedback after measuring what Steve suggested above ... ;-)
     
  8. ragtop1

    ragtop1 F1 Veteran
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    Nov 11, 2006
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    I experienced the same turn signal issue in the spring. It pointed to the connections on the hazard switch. I pulled off the spade connectors, cleaned them with sandpaper and now the signals work great again. If cleaning doesn't work, I would replace the hazard switch.
    I too believe that the brake lite problem is a separate issue.
     
  9. GrayTA

    GrayTA F1 World Champ
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    Jun 25, 2006
    15,130
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    PDG
    I have also been having the turn signal problem.

    I just installed Birdmans Fusebox a few months ago. Any ideas??



    PDG
     
  10. ragtop1

    ragtop1 F1 Veteran
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    Per my previous post. Turn signal wires lead to the flasher switch. Check the connections. Its very easy to remove it for inspction and service.
     
  11. miketuason

    miketuason F1 World Champ
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    Feb 24, 2006
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    Sometimes the fuse appears to be good when they're actually not.
     
  12. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    I know, that's why I am going to get busy with a meter in a little while.

    I am not in front of the owner's manual at the moment, but does each turn signal side have it's own fuse or are all four tied into one? It would be weird for both sides to die at the same time if they are separate.
     
  13. ME308

    ME308 Formula 3

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    #13 ME308, Oct 31, 2014
    Last edited: Oct 31, 2014
    turn signal indicators have no direct fuse (except for fuse 1 which also feeds wipers, wishwasher pump, rad fans and window motors )

    they are fed via the hazard switch (which gets it`s power via fuse 1 and fuse 6 and further to the flasher relay) -
    since your indicators work when activating the hazard switch, the flasher relay is o.k.

    -
     
  14. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    Wipers etc. all work.

    All the fuses are fine.

    Hazard blinkers still blink.

    Brake lights still out Turn signals still out but all the rest of the lights outside of the car are fine.

    What should I check next?
     
  15. ragtop1

    ragtop1 F1 Veteran
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    I guess my previous post is invisible :), but I would strongly suggest cleaning the connections on the hazard switch. Remove the hazard control switch, pull off the spade connectors, clean the metal contacts. It worked like a charm for me. It is definitely worth the effort
     
  16. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    Gonna take your advice first thing in the morning
     
  17. pgarossino

    pgarossino Formula Junior

    Nov 19, 2009
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    Paul G.A. Garossino
    I hope simply cleaning the connections worked for you.

    I had the turn signal problem with my 84 QV a few years ago and when replacing the signal relay failed to fix anything I went after the hazard switch. Cleaning the connections did nothing in my case as the switch itself was toast. I replaced the switch and immediately had all flashers back.

    It was obvious that someone had messed with the hazard switch in the past as the body of the old switch was held together with a tie-wrap!!

    Paul
     
  18. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Any chance yet to investigate further? If fiddling with the hazard switch fixes the brake lights, you ARE a witch doctor ;), but you could have two separate unrelated problems as Michael suggested earlier.

    Even though the wipers are working, the bottom of the fuseblock also has a bunch of metal parts riveted together to "branch" things out to many male spades and separate wires -- so one easy thing to try would just be shifting the wires connected there around onto different male spades and see if something else starts working (and the wipers don't) -- just a thought...
     
  19. ragtop1

    ragtop1 F1 Veteran
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    Hey Tommy. Are you ok ? We haven't heard from you in a while. I hope all is well.
     

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