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Thread: Blinker voltage drop

  1. #1
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    kotu100's Avatar
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    Default Blinker voltage drop

    Been trying to trouble shoot this for a couple weeks now unsuccessfully.

    When i turn my blinker on i can hear my AEM fuel pump fluctuating with the blinker but it doesn't happen with the hazards. Also the parking brake light on the dash dims with the blinker but not the hazards.

    I've checked the voltage drop for the blinker system but can't seem to find anything wrong. I know the hazard switch is what tells the system whether to get power from the 7.5A blinker fuse or the 15A hazard fuse.

    Any ideas?

  2. #2
    Established 1994
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    Default Re: Blinker voltage drop

    What is your battery voltage when this is going on? Have the car off and turned off the blinkers on and test. You should have a minimal drop. An overpriced but damn useful tool like the SPX OTC battery tester might say your 540 CCA battery is actually only good for 410 CCA these days. Which will still start the car.
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  3. #3
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    Default Re: Blinker voltage drop

    Just check it and battery volts with key off only jumps from 12.5 to 12.48-12.49 with the blinker on and the fuel pump doesn't fluctuate.
    With car running volts is jumping from 14.5-15 with the blinker on. This is with a new carquest alt.


    I have no problem starting the car, my issue lies in the voltage drop causing my fuel pump and ecu voltage to fluctuate.
    Don't really see what CCA has to do with this.

  4. #4
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    Default Re: Blinker voltage drop

    Quote Originally Posted by kotu100 View Post
    Don't really see what CCA has to do with this.
    Where do you think the voltage comes from? Good luck.
    Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other.

    www.thereligionofpeace.com <------- stay in the know, religion drives political beliefs

  5. #5
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    Default Re: Blinker voltage drop

    Check your fuel pump ground while its running. I bet its bad and its trying to ground through another circuit.


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  6. #6
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    Default Re: Blinker voltage drop

    Quote Originally Posted by MK3Supra17 View Post
    Check your fuel pump ground while its running. I bet its bad and its trying to ground through another circuit.
    Thanks for the suggestion. I actually rewired the ground for the fuel pump altogether to eliminate that possibility.

    I'm pretty sure the issue is the alternator, it got better with a parts store replacement but the voltage still jumps when a load is put on the electrical system. I think I need to get a Bosch or upgraded DM alt.

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