Fast Blinker-new bulb didn't fix the problem | FerrariChat

Fast Blinker-new bulb didn't fix the problem

Discussion in 'Technical Q&A' started by slong, Apr 22, 2006.

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  1. slong

    slong Rookie

    Feb 14, 2004
    17
    I have a fast left-turn-signal...the left front doesn't flash (back left is fine), so I thought it was simply a burnt bulb....I changed the bulb and the problem continues. Note: the fuse is fine as the right-turn signal works (front and back) and the rear left works fine, so it is definetley a front left issue. Also, the parking lights work, except for the same bulb for the left turn signal (outside bulb in housing of 3 bulbs). Any suggestions?

    1989 328 GTS.
    Many thanks.
    SL
     
  2. dm_n_stuff

    dm_n_stuff Four Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2003
    43,745
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    Dave M.
    Did you look at the bulb you took out?

    It may be a bad ground or broken wire. Check continuity from the bulb connection for that.

    DM
     
  3. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,220
    Mount Isa, Australia
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    Pap
    Also.......check for power to that left front side with a test light. Maybe the main wiring plug for that corner has a bad connection or broken wire somwhere. Shoudnt be difficult to diagnose and fix. :)
     
  4. slong

    slong Rookie

    Feb 14, 2004
    17
    thank you for the advice...but I'm not sure I have the correct tools...can you tell me the tools i need to buy at the local auto-parts retailer to solve my problem..
     
  5. dm_n_stuff

    dm_n_stuff Four Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2003
    43,745
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    Dave M.
  6. slong

    slong Rookie

    Feb 14, 2004
    17
    excellent...one more question: how do i test for all the issues you brought up...ie, remove the bulb, but probe in socket, etc...pls forgive my limited knowledge...that is why I trust the member of FChat...thanks. SL
     
  7. dm_n_stuff

    dm_n_stuff Four Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2003
    43,745
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    Dave M.
    It's not tough. Follow the instructions that come with the meter but, in a nutshell, to see if you have a broken wire or bad connection you're going to check continuity. Simple operation.

    After inserting the leads in the proper holes on the meter, and setting the meter to read continuity, you touch one lead to one end of whatever connection you are testing, and the other lead to the other end. If the bulb is removed, then each circuit can only complete itself through the meter.

    If there's a broken wire, no continuity. The meter will usually make a tone if you have continuity. Easiest way to check that is to touch the leads to each other, you'll have continuity there, and get the tone if it makes one. Otherwise, make note of what the digital display reads for continuity.

    To check a circuit, you need to know where it starts and ends. The electrical diagram for the car can help there. It'll indicate the color of the wire in question, and where it is attached to the fuses. PULL THE FUSE FIRST. THat will insure you're checking the circuit from the fuse to the light.

    A little trial and error will get you there, and again, if you google multimeter, there are several excellent sites that give nice complete instructions.
     
  8. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,220
    Mount Isa, Australia
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    Pap
    Dont wanna upset you dm_n_stuff. But it would be quicker to check for power to the plug with a test light IMO But would be good to buy a mulitmeter anyways slong,they are very very useful. :) Check for power to that corner/plug/circuit using at test light,thats what i would do. That will also tell you if you have a broken wire or a bad connection there somewhere,wont it not? :) Slong,you can go a few ways about it brother. Its great to learn as much as you can anyways.Heres how i would do it man using a test light. Very simple.

    1-Remove the bulb and then probe inside the bulb holder and check to see if the test light "lights" up. Im assuming it wont,cause you have no power there because the bulb doesnt flash. :)

    2-Back probe the back of the bulb holder too see if it has power goin in. It may be the bulb holder is faulty,has corroded terminals ect..... If it has power to the back of the bulb holder,then you know the bulb holder is faulty.

    3-If you have no power goin to the bulb holder,too easy........trace back the wiring from there till you come across a plug that goes to into the main wiring harness. And there should be one there somewhere. Then do the same. Disconnect the plug,or back probe it and see if it has power going into the plug. If it has no power,then that could be a bad connection in that plug. Disconnect plug,if already havent and clean with some electrical cleaner(Stabilant 22 ect..)

    4-If you have now power there also/after that,thats when it gets exciting,as after that,the wiring for the plug,would be heatshrinked wrapped into a bunch of other wires goin back to the fuse box. Can be very fustrating tracing wires back. But........................i dont really think that will be the case here man. I reckon you have a bad connection/broken wire or faulty bulb holder here in your case brother. :)

    Give that a go. :) It can also be done using a multimeter too brother. Test light is quicker and simpler IMO.
    If you want,i can post a few quick pics using a test light to shed some light on it being done Slong if you want? :)
     
  9. dm_n_stuff

    dm_n_stuff Four Time F1 World Champ
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    Dec 10, 2003
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    Not steppin' on my toes at all.

    I just find the aded functions that a mutimeter has useful, great for looking for battery drains and the like, which a test light won't do.

    dm
     
  10. PAP 348

    PAP 348 Ten Time F1 World Champ
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    Dec 10, 2005
    100,220
    Mount Isa, Australia
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    Pap
    Thats absolutely correct. Multimeters are worth their weight in gold :D
    As i said,he should buy one,and learn to use it also. In case more electrical problems arise and it is needed. But a test light is also very very handy to have in the tool box. Having said that,i have 2 Fluke multimeters and 3 test lights :p
     
  11. ferrarioldman

    ferrarioldman Formula 3
    Professional Ferrari Technician Silver Subscribed

    Jun 19, 2002
    1,033
    Summerfield, NC
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    Tom Jones
    What kind of bulb did you put in it? An 1157 won't work correctly.
     
  12. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,220
    Mount Isa, Australia
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    Pap

    :eek: Now that you mention it......... I have seen people fit the wrong bulbs many times before.
     
  13. slong

    slong Rookie

    Feb 14, 2004
    17
    yes it could be the "bulb"...went to local auto retailer (not AutoZone, but similar) and they had a difficult time finding the correct bulb, so they sold me the following: P21W12498Philips12V21W 2CH H518 (as printed on the housing of the bulb). I tried to swap-out the other directional bulb from the right-side (which works), but couldn't get the orange housing removed and didn't want to force remove it for fear of breaking it...It appears that housing is slightly higher up and pin'd...will try again to remove. But where should i get the "correct" bulb? SL
     
  14. dm_n_stuff

    dm_n_stuff Four Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2003
    43,745
    26.806311,-81.755805
    Full Name:
    Dave M.
    Try the dealer. It's probably one of the few pats that will only cost 2X as much as you think it should, but still be affordable at under $3.00.

    Or,

    https://www.owners.ferrari.com/

    But, then you'll have to wait while it ships from England.

    Did you try Daniel at Ricambi America? www.ricambiamerica.com

    dm
     
  15. slong

    slong Rookie

    Feb 14, 2004
    17
    OK...got the other turn signal housing off and switched all bulbs...all bulbs are "good". So I reached behind (very tight fit for fingers) the housing and fiddled with the wires behind the bulb housing and it worked so the problem is a loose wire...now I need to know how to get to those wires behind the housing (housing for the orange turn signal and fog light assemble)...I can't figure out how to remove so I can access the wires that connect into the bulb slots...it is definitely a connection behind the bulb housing. If I can remove and access the wires, my problem is solved (hopefully).
     
  16. slong

    slong Rookie

    Feb 14, 2004
    17
    Disregard the previous post re: how to remove the housing....I got it off...now I have to fix the connection.....stay tuned
     
  17. slong

    slong Rookie

    Feb 14, 2004
    17
    Ok...to recap...it wasn't a burnt bulb and I managed to remove the lighting housing without breaking anything...the problem was the wire connecting the bulb housing was cut and shorting out...some electical tape + more wire wiggleroom did on trick. Thank you all for the information. SL
     

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