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Thread: Surging headlights?

  1. #1
    Registered Member Corphish's Avatar

    83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i

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    Surging headlights?

    Ever since I got my p5 I swore my headlights would randomly get brighter or darker for like a split second. But every time I asked anyone with me if they saw it they told me I was crazy but lately I've been driving more often and I swear it's there and I notice it! Any ideas why?

  2. #2
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    Quote Originally Posted by Corphish View Post
    ... they told me I was crazy...
    Any ideas why?
    Because you're crazy...
    You need to see your doctor...
    There's medication available that can help with your hallucinations...

    OR ...

    If they are actually are flickering... (you'll need witnesses for clarification)

    You could do the "Big Three" and improve all your ground points.

    The alternator is controlled by the ECU ...

    Check and clean the connector on your alternator to help make sure your ECU can speak clearly to it...
    You want a solid clean connection between the two.



    The LG/W wire is the control wire coming from the ECU...
    It adjusts the alternator's output voltage and current.
    Make sure is is a clean/solid connection.

  3. #3
    Registered Member Corphish's Avatar

    83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i

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    Quote Originally Posted by pcb View Post
    Because you're crazy...
    You need to see your doctor...
    There's medication available that can help with your hallucinations...

    OR ...

    If they are actually are flickering... (you'll need witnesses for clarification)

    You could do the "Big Three" and improve all your ground points.

    The alternator is controlled by the ECU ...

    Check and clean the connector on your alternator to help make sure your ECU can speak clearly to it...
    You want a solid clean connection between the two.



    The LG/W wire is the control wire coming from the ECU...
    It adjusts the alternator's output voltage and current.
    Make sure is is a clean/solid connection.
    I appreciate all the help but I have no idea what I'm looking at in that picture!

  4. #4
    Registered Member NaturalFlavored's Avatar

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    Just clean the ground for the alternator and make sure the wire is good. Mine does it too.

  5. #5
    Registered Member Corphish's Avatar

    83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i

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    Ok thanks guys!

  6. #6
    ZOOOOOOOOOM ZOOOOOOOOOOOM mazdadude's Avatar

    '16.5 Mazda CX-5 Touring AWD, '05 PRIUS

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    Since the alternator charging circuit is controlled by the computer. Besides the grounds as already mentioned, I would RE-SEAT the computer connectors. Since the computer is down under by the passenger feet, it is susceptible to moisture and corrosion.
    Mazda's I have owned over the years.
    80' Mazda GLC SPORT MT - sold
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  7. #7
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    Our electrical system is generally considered underpowered and quite sucky...

    The "Big Three" mod. is a great idea and can really help... Especially when you throw in the stereo and the 140 amp high output alternator.


    https://www.mazdas247.com/forum/show...st%20grounding


  8. #8
    Registered Member Corphish's Avatar

    83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i

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    Someone wanna explain "Big Three"? I tried using the search but couldn't find anything

  9. #9
    The Diagram Dude pcb's Avatar

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    It refers to the three main power wires on a car.
    Alternator + to battery +, alternator to ground, battery to ground, and engine block to ground... (yes I know.. that's four)

    The link above shows all the spots where our cars have grounding points.


  10. #10
    Registered Member Corphish's Avatar

    83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i

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    Alright so I finally got time to finish reading everything and I just wanted to know is that kit still out there? Or should I just get some 8 gauge wire?

  11. #11
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    Quote Originally Posted by pcb View Post
    Our electrical system is generally considered underpowered and quite sucky...

    The "Big Three" mod. is a great idea and can really help... Especially when you throw in the stereo and the 140 amp high output alternator.


    https://www.mazdas247.com/forum/show...st%20grounding

    The manufacturer for this alternator is "Maniac EM". Not a known brand name at all. Anyone on here have this alternator on their P5 and can give feedback?

    Also, is it plug n play? The one comment I found in that Amazon listing suggests it may not be.


  12. #12
    The Diagram Dude pcb's Avatar

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    I don't know about brand or fitment but I found this one too...


  13. #13
    Registered Member Corphish's Avatar

    83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i

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    Surging headlights?

    Ok guys I did the big 3 mod and now my charging light is on. Any ideas?

    I used 0 gauge monster wire.

  14. #14
    The Diagram Dude pcb's Avatar

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    Check the connector and ground at the alternator.

    Check your voltage at the battery terminals before and after starting your car.
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  15. #15
    Registered Member Corphish's Avatar

    83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i

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    Is it possible that I'm using too big of a gauge of wire?

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