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Thread: Fuse keeps blowing, any ideas?

  1. #1
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    Fuse keeps blowing, any ideas?

    So I had a system (2 12" subs and amp) installed. After about 6 months, the subs began to cut in and out periodically. A few months after that, they cut out for good. I took it to a car audio place, and they said the fuse blew, and replaced it. 3 months after that, the subs cut out permanently again. I assume the fuse is blown again. I don't really know alot about car audio. Has anyone had this problem / know what could be the problem? Thanks.

    -Matt

  2. #2
    Maximum Bitrate kegobeer's Avatar
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    What head unit do you have? Are you blasting your music and maybe overloading the amps/subs?
    1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.

  3. #3
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    It's the stock head unit for a 09 Ford Focus. It's on loud, but no where near the max, not even half way.

    -Matt

  4. #4
    MySQL Error soundman98's Avatar
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    what amp do you have? who installed the gear?

  5. #5
    Variable Bitrate djvillar's Avatar
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    If the fuse keeps blowing, its doing its job. If it instantly blows as soon as you power the amp, I would say there's a short/ground somewhere popping the fuse.

    Also check the rating of the amp. Do you have two 4 ohm subs wired in parallel making it a 2 ohm load on you amp? If your amp isn't rated for 2 ohms, that could be a problem. If it is rated for 2 ohm at 500 watt's and you got a 2ohm load that wants 1000 watt, that could be a problem.

  6. #6
    Raw Wave
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    A general rule is to size the fuse so that it normally runs at no more than 70% if rated current.
    Above that they get excessively hot and hence fail prematurely.

    The problem is that amps can run nearly full power which is also around their fuse rating (because you need to protect the load) and hence 80%, 90% of full rating.

    Their heat is exponential to their current, and every 10C or 15C halves their life.
    Hence fuses for deaf people in hot climates don't last long.


    You may have another problem, but environment and how you use it can be factors.

  7. #7
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    The amp is a Autotek Super Sport. SS75.2. There are 2 12" Punch subs with it. Everything else is stock. I'm not sure how to check what the current the amp is rated for. I also can't tell the current rating of the fuse thats in there now, there doesn't seem to be any markings on it. Thanks for the help so far.

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