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Thread: Flickering electrical system voltage issues?

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    Uber Mirage alex16's Avatar
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    Flickering electrical system voltage issues?

    It looks like what I was told in electrical diagnosing of GM cars to be a diode in the alternator failing causing the entire electrical system to flicker at idle sometimes. I took a video of it, it goes away if you rev the engine or change the electrical load.





    Last edited by Eggman; 12-26-2017 at 10:43 PM. Reason: Fixed embedded video link.
    2014 ES F5MBD aka 5MT. I am a full time Uber driver, if you want to drive for uber DO not sign up without my referral code for a bonus .

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        click to view fuel log View my fuel log 2014 Mirage ES 1.2 manual: 44.8 mpg (US) ... 19.1 km/L ... 5.2 L/100 km ... 53.9 mpg (Imp)


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    Moderator Eggman's Avatar
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    1. Is your motor up to temperature or is this a cold start? The PTC heaters draw a considerable amount of power.
    2. How old is your battery? It might be aging out and cold outdoor temperatures will make this worse.

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        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 50.1 mpg (US) ... 21.3 km/L ... 4.7 L/100 km ... 60.2 mpg (Imp)


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    Uber Mirage alex16's Avatar
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    Battery is 1 1/2 years old or so upgraded to a 600+ cca. Engine at full operating temp.




    It was replaced 7-11-2016 with a 725cca battery that's still under warranty. I'll exchange it when it warms up a bit.


    http://mirageforum.com/forum/showthr...ry-replacement
    Last edited by alex16; 12-26-2017 at 11:36 PM.
    2014 ES F5MBD aka 5MT. I am a full time Uber driver, if you want to drive for uber DO not sign up without my referral code for a bonus .

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        click to view fuel log View my fuel log 2014 Mirage ES 1.2 manual: 44.8 mpg (US) ... 19.1 km/L ... 5.2 L/100 km ... 53.9 mpg (Imp)


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    Senior Member Mitz's Avatar
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    Have you checked the battery connections? If the nuts are somewhat loose, it can cause also flickering .. had an experience w/ it.

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    Senior Member Cobrajet's Avatar
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    First thing I would do is hook a multimeter up to the battery terminals when the engine is idling. See what kind of voltage you get.

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    Senior Member Mitz's Avatar
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    Quote Originally Posted by Cobrajet View Post
    First thing I would do is hook a multimeter up to the battery terminals when the engine is idling. See what kind of voltage you get.
    Yes.. additionally you may want to test the voltage drop across the battery post and the battery cable lug terminal.

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    Uber Mirage alex16's Avatar
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    Battery cables are tight. My volt meter is in my garage about 4 hours away, might stop by harbor freight tomorrow and grab one. It doesn't do this all the time just randomly. Car starts up ice cold with headlights on easily.
    2014 ES F5MBD aka 5MT. I am a full time Uber driver, if you want to drive for uber DO not sign up without my referral code for a bonus .

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage ES 1.2 manual: 44.8 mpg (US) ... 19.1 km/L ... 5.2 L/100 km ... 53.9 mpg (Imp)


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    Get one of this when you stop a HF, make sure the batt. terminals are completely clean no corrosion at all. Also make sure the

    connector at the alternator is also free of corrosion. https://www.harborfreight.com/batter...ner-94450.html


    2014 Mitsubishi Mirage ES.

    2002 Mitsubishi Montero Limited

    1987 Toyota 4Runner SR5

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