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Amp not working

My amp just stopped working it keeps blowing the 100 amp fuse in my main power wire every tome i turn it on, theleds blink faintly and the amp makes a cliking sound, so i opened it up and really checked it over i seen nothing to lead me to beleive that its blown,would you have any ideas?

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  • loren_nov May 07, 2008

    my amp is a punch 1000 2 channle thanks for taking the time to answer.

  • Anonymous Jun 26, 2008

    cs800 breker fuse 15a blows when power is turn on

  • Daper07 Feb 11, 2009

    my amp is a ppi pcx 5800 and it keeps blowing a 100 watt main power fuse . Every time i put a new fuse in it pops.

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  • Master
  • 631 Answers

If the fuse only blows after remote voltage is applied, it likely has shorted output transistors.

You should confirm that nothing external is causing this by disconnecting the speaker wires from the amplifier's speaker terminals and disconnecting the RCA cables from the jacks.

What make/model amp is this?

Posted on May 03, 2008

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Posted on Jan 02, 2017

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Hi, Anonymous before diagnosing your blown fuse issue, check the bottom of your seat, if it's metal and comes in close proximity to the positive battery post you need to take the necessary steps to ensure there is no contact (electrical tape, thick rubber insulation, hammer a dent in the seat bottom etc.) You are going to need a wiring diagram from your service manual, a test light, an ohmmeter and plenty of extra fuses.
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If you driving down the road for 30 minutes or 15 miles and blow a fuse you have soft/flying short and may take some time and patience to find.
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When the fuses blow like that suspect an overload in either the power supply or main amp stages. I think you might have damaged one or more of the output devices. They can develop faults quick if you're using the wrong type speakers or have faulty wiring to them. The main cause of fuse blowing is a semi-conductor device that is acting like it is a piece of wire. For instance an output transistor when connected to a multi-meter on the ohm scale, will show a full scale deflection, just like if you had touch the two test probes together.

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My 2005 honda vt750 shadow keeps blowing the 30 amp fuse at low revs. just kills the main power and stalls. . Can anyone help??


Hi, Rickuniversa before diagnosing your blown fuse issue, check the bottom of your seat, if it's metal and comes in close proximity to the positive battery post you need to take the necessary steps to ensure there is no contact (electrical tape, thick rubber insulation, hammer a dent in the seat bottom etc.) You are going to need a wiring diagram from your service manual, a test light, an ohmmeter and plenty of extra fuses.
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2 Answers

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It would be very dangerous to bypass a fuse. If it keeps blowing, bypassing the fuse will only create lots of internal damage and maybe a fire as well. The fuse is blowing for a reason, the amplifier is not going to somehow start working because you bypassed the fuse. You also need to stop trying to turn it on, every time it blows the fuse, it keeps stressing the components inside. You have a shorted power supply, probably water damage as well since the power wire got wet.

I repair car amplifiers for a living, and can tell you with all honesty that bypassing the fuse would be a terrible mistake to make, the amplifier would end up being un-fixable with holes burned right into the board.

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