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Thread: Need HELP! Headunit wont play while engine is running

  1. #1
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    Question Need HELP! Headunit wont play while engine is running

    Ok here is one for the experts, i have a 2006 joyner sandviper / Dune buggy 3cylinder engine full size alternator 12v system. I recently installed a JVC headunit and some speakers. The headunit plays fine and everything works perfectly...with the engine off when i start the engine the unit display just blinks, i have the constant power right to the battery, and the other 12v to a key on power, unit is grounded to frame. now i belive i figured out that not running the battery voltage is 12.25 running it is 14.40. so that trips up the head unit... question is how do i regulate the voltage to stay in the 12v range so the headunit will play with the engine running?

    THANKS IN ADVANCE

  2. #2
    MySQL Error scott_fx's Avatar
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    all car audio is designed to run at 14.4v. thats not your problem
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  3. #3
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    well ok i understand they can run at 14.4 but there must be some voltage spikes coming from the alt. cause everything else is setup perfectly/ any way how can i regulate the voltage anyway?? I bought a Radio shack 7812 regualtor 1 Amp. i put it in line with the constant power, makes it light up but no play??

  4. #4
    Neither darque nor pervert DarquePervert's Avatar
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    Something is not wired correctly, plain and simple.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  5. #5
    MySQL Error scott_fx's Avatar
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    yeah, i have a feeling it doesn't have anything to do with the radio either. did you test all the voltages after you start the car? does the h/u stay on if you temporarily connect the ign lead on the harness to the 12v constant?
    New System in progress:
    M10k
    Phaze TD1500 ~> Dynaudio MD130
    Phaze TD1500 ~> Seas g18rnx/p
    Zapco Ref 500.1 ~ 12" tc-9
    Behringer DCX2496 ~ Envision Electronics psu
    Transflective Xenarc

    My Car Pc Install
    My Boat Pc worklog

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