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    why do i need a fuse at the amp?

    hi

    just wondering
    why do i need a fuse at the amp?

    cant i just have a fuse at the battery terminal and thats it?







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    Re: why do i need a fuse at the amp?

    Quote Originally Posted by Jmac
    You only need one fuse on the power wire, which should be located in the engine bay with a fuse rated at less than the current capacity of the wire ...

    You shouldn't need to fuse the power wire twice ...
    i 100% agree with you!

    the only reason i asked is because
    i saw this
    http://www.bcae1.com/images/swfs/sys...nassistant.swf

    why do they have fuses at the amp (each)
    they already have a fuse at the battery terminal.
    hmm




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    Re: why do i need a fuse at the amp?

    Quote Originally Posted by Jmac
    Every time you change wire sizes, it's recommended that you fuse the new wire ... The reason is that the current capacity of a smaller wire will be less than the larger wire and, if the fuse at the battery can handle more current than the smaller wire, you have yourself a fire hazard ...
    true.

    ok then we should remove the fuse at the battery terminal
    its of no use.

    since there we already have fuses at each amp terminal.

    if there is too much current going into the amp it will cut off the amp that has too much current the other one will continue to work!
    its not like that?




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    Re: why do i need a fuse at the amp?

    Quote Originally Posted by Jmac
    If you don't have a fuse at the battery and the power wire grounds out somewhere between the battery and the fuse in the back, don't be suprised if this happens ...
    ok with the battery fuse left out
    this is what i mean

    BBBB----------|--FUSE1---AMP1----|
    |...................|............................. .|
    |...................|---FUSE2---AMP2---|
    |................................................. .|
    GGGGGGGGGGGGGGGGGGGGGGGG


    . = space
    | = postive wire
    B = battery
    G = ground



    case one;
    1)there is a overload of current in the wire to amp1,
    2) fuse1 will cut off.
    3) amp1 stops working, amp2 will continue to work!

    case two;
    1)there is a overload of current in the wire to amp2,
    2) fuse2 will cut off.
    3) amp2 stops working, amp1 will continue to work!

    case three;
    1) there is a overload of current at both amp1 and amp2
    2) both fuse1 and fuse2 cuts out both amps stop working!




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    Re: why do i need a fuse at the amp?

    Always keep a fuse up under the hood next to the battery. You can have a distrubution box with fuses in the rear if you want.





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    Re: why do i need a fuse at the amp?

    Quote Originally Posted by Jmac
    Case 1 & 2 are correct ...

    Case 3 may not necessarily always happen that way as the primary fuse (fuse near battery) may blow first ...
    case 3:
    both amps would not overload instantly at the same time.
    even if it does. (less then 1% chance)

    each individually fuse will cut each wire seperately so both amps are protect!
    (ie the wiring isn't burning aswell)

    hm




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    Re: why do i need a fuse at the amp?

    You only need a fuse at an amp if you are running two or more amps.
    Remember now, this is very important, when running your power cable from the battery to the amp, the fuse MUST be within 18 inches of the pos. battery post.

    Check out this site. I use it a lot for reference.

    http://www.bcae1.com/



    Ride: 1998 Honda Accord EX Coupe
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    Epicenter (in dash)
    Aphex Processer by Kove Audio
    Capacitor: 1 Frad Rockford Fosgate (monitor top)
    Amp: MTX 405 (5-ch.)
    Front: Boston Acoustics Pro60
    Rear: Boston Acoustics SX95
    Sub: 1 (one) Eclipse SW8122DVC (12 in. sub)

    Added the "BIG 3"
    Load Boss Alternator (180 Amps)
    One HC1400 Kinetik Battery (using as main battery)

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    Re: why do i need a fuse at the amp?

    we need the fuse at the battery terminal

    in the case where
    both amp1 or amp2 etc is not overloading!
    but instead the power wire going from the battery to the "distrubtion block" is shorted! (short circuited +ve touching is ground)


    it adds extra protection in that case.


    (ok answered my own questions




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    Re: why do i need a fuse at the amp?

    yep, you sure did...lol



    Ride: 1998 Honda Accord EX Coupe
    HU: Alpine DVA-9681
    Epicenter (in dash)
    Aphex Processer by Kove Audio
    Capacitor: 1 Frad Rockford Fosgate (monitor top)
    Amp: MTX 405 (5-ch.)
    Front: Boston Acoustics Pro60
    Rear: Boston Acoustics SX95
    Sub: 1 (one) Eclipse SW8122DVC (12 in. sub)

    Added the "BIG 3"
    Load Boss Alternator (180 Amps)
    One HC1400 Kinetik Battery (using as main battery)

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    Re: why do i need a fuse at the amp?

    Yes, I agree with you about that it should be as close to the battery as possible. 18 inches is the max. length of power cable that is needed to be safe. It is a MUST!



    Ride: 1998 Honda Accord EX Coupe
    HU: Alpine DVA-9681
    Epicenter (in dash)
    Aphex Processer by Kove Audio
    Capacitor: 1 Frad Rockford Fosgate (monitor top)
    Amp: MTX 405 (5-ch.)
    Front: Boston Acoustics Pro60
    Rear: Boston Acoustics SX95
    Sub: 1 (one) Eclipse SW8122DVC (12 in. sub)

    Added the "BIG 3"
    Load Boss Alternator (180 Amps)
    One HC1400 Kinetik Battery (using as main battery)

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    Re: why do i need a fuse at the amp?

    For the underhood thing, why does it have to be 18 inches? If it's to lessen the chance of the wire grounding out before the fuse, can't that still happen? Could a fire still occur if the wire grounds out before the fuse? I would think the best thing to make is a battery terminal with a built-in fuseholder. But I don't know if there is any possibility of fire if the wire was to ground out before the fuse? Since the wire will be so short it could probably not catch fire, but wouldn't that mean that the battery would explode?
    Last edited by ThatDude; 04-23-2005 at 12:41 AM.




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