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Reload Thread: Fan Doesn't turn off when car is off!!

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    TTU's Avatar
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    Fan Doesn't turn off when car is off!!

    I just bought a fan to put under my seat to cool off one of my amps. I plugged the power to the fan into the power for the amp, and then the ground to the fan just on a random metal screw next to it. Anyways whenever I turn the car off the fan keeps going....







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    Re: Fan Doesn't turn off when car is off!!

    the power to the amp DOESN'T turn off.
    get a relay to trigger the fan and amp using the HU's remote wire.



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    Re: Fan Doesn't turn off when car is off!!

    djman hit it right on the nose.

    Is the power wire for the amp connected to constant power (ergo the car's battery)?

    The only "Off" position for the car's battery will be when it is completely discharged. Otherwise, if it has current at all it will keep that fan running constantly.

    You need to power that fan with some sort of switched power either by going with djman's suggestion or putting a toggle switch inline with the power feed to the fan or something similar.



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    Re: Fan Doesn't turn off when car is off!!

    Quote Originally Posted by djman37
    get a relay to trigger the fan and amp using the HU's remote wire.

    What do you mean by this. Also I tried putting the power wire where the remote wire is on the amp but it wasn't as powerful and there was interference with the music.




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    Re: Fan Doesn't turn off when car is off!!

    You can't power it from the remote lead directly, it can't supply the current needed and might damage the HU. What you can do is use a relay. A relay is a switch that uses an electric signal (the remote turn on lead) to switch a higher current power source. Basically you would run a 12V constant power wire to the input of the relay. The ground terminal for the relay is grounded. The trigger terminal is connected to the remote from the HU and the switched output is run to both the amp and the fan. The fan is then grounded as well.



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    Re: Fan Doesn't turn off when car is off!!

    Wow, I sould just go pay them $35 to do it because I don't really have any idea what you just said.




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    Re: Fan Doesn't turn off when car is off!!

    Quote Originally Posted by TTU
    Wow, I sould just go pay them $35 to do it because I don't really have any idea what you just said.
    No, do it yoruself that wya you learn and know what you are doing,. therefor you can do it yoruslef again and help others in the future. No reason to stay clueless and ignorant.




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    Re: Fan Doesn't turn off when car is off!!

    Ok so I need to buy a switch then you're saying? Can someone just go in Paint and draw me a diagram please.




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    Re: Fan Doesn't turn off when car is off!!

    What helo is suggesting that you do truly isn't that difficult...even for a complete novice.

    Get yourself a 30 amp SPST (single pole, single throw) relay something like this.
    For that relay you'll need to connect it to its own power and ground sources which will use two of the four terminals found on the underside of the relay (instructions on which terminal is which usually come either inside or printed on the packaging)
    After that you'll be left with two more terminals. One of these will be an output. The output terminal will go to whatever it is you're wanting to use the relay to activate (in your case it will be the fan and the remote turn-on input on your amplifier)
    The last terminal you'll have left is the trigger input. This works pretty much the same as the remote turn-on input for your amplifier. That terminal detects the presence of or lack of 12vdc current to tell it whether or not to activate.
    You'll want to connect the remote accessory activation output (the wire you currently have going from your HU to the remote turn-on input for the amp) to this trigger input.

    If connected properly when the HU goes on and off then likewise so will your amplifier and the cooling fan you've added for it.



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    Re: Fan Doesn't turn off when car is off!!

    Quote Originally Posted by Prowler573

    Get yourself a 30 amp SPST (single pole, single throw) relay something like this.
    For that relay you'll need to connect it to its own power and ground sources which will use two of the four terminals found on the underside of the relay (instructions on which terminal is which usually come either inside or printed on the packaging)
    Ok, Can I just run it from the power and ground terminals on the amp?

    After that you'll be left with two more terminals. One of these will be an output. The output terminal will go to whatever it is you're wanting to use the relay to activate (in your case it will be the fan and the remote turn-on input on your amplifier)

    What's the remote turn-on input? The remote wire?

    The last terminal you'll have left is the trigger input. This works pretty much the same as the remote turn-on input for your amplifier. That terminal detects the presence of or lack of 12vdc current to tell it whether or not to activate.
    You'll want to connect the remote accessory activation output (the wire you currently have going from your HU to the remote turn-on input for the amp) to this trigger input.
    So I'm connecting the remote wire in 2 different places on this thing and it is no longer connected to the amp?




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    Re: Fan Doesn't turn off when car is off!!

    Quote Originally Posted by TTU
    Ok, Can I just run it from the power and ground terminals on the amp?
    Yes you can but the best method would be to run new power and ground feeds altogether. But the easy answer to your question is yes.




    What's the remote turn-on input? The remote wire?
    No - it is the connection terminal on your amplifier where the remote wire attaches.



    So I'm connecting the remote wire in 2 different places on this thing and it is no longer connected to the amp?
    Nope. The remote wire coming from the headunit connects to the trigger input terminal on the relay. The output terminal on the relay then feeds the amp's remote turn-on input (reference above answer) and the power input on your fan.



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    Re: Fan Doesn't turn off when car is off!!

    nvm got beat...





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    Re: Fan Doesn't turn off when car is off!!

    Quote Originally Posted by jujumantb
    nvm got beat...
    I was going to take issue with part of your answer anyway. If the relay that is being incorporated is serving amp remote turn-on duties then why in the world would the remote wire coming from the deck still be connected to the amp??



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    Re: Fan Doesn't turn off when car is off!!

    Quote Originally Posted by Prowler573
    Yes you can but the best method would be to run new power and ground feeds altogether. But the easy answer to your question is yes.




    No - it is the connection terminal on your amplifier where the remote wire attaches.



    Nope. The remote wire coming from the headunit connects to the trigger input terminal on the relay. The output terminal on the relay then feeds the amp's remote turn-on input (reference above answer) and the power input on your fan.

    Ok I think I understand now. Thanks for the help.




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    Re: Fan Doesn't turn off when car is off!!

    Quote Originally Posted by Prowler573
    I was going to take issue with part of your answer anyway. If the relay that is being incorporated is serving amp remote turn-on duties then why in the world would the remote wire coming from the deck still be connected to the amp??
    haha, hence why I totally took it down and hoped nobody would see it
    Though my answer would still work
    brainfart...





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