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I think that there may be a short in my car audio bc a fuse blows every time

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  • Ronnie Wilson May 11, 2010

    i think that there may be a short in my car
    audio bc a fuse blows every time ??????????



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The fuse trips for a reason, probably blown output stage ..needs a service or replacement

Posted on Jan 16, 2009

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My car amp just started blowing the inline fuse every time I hook it up. Why?

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Have you checked the speakers are of the correct impedence, car audio equipment is usually 4 ohm. If the loading is less it can effect the performance of an amplifier which is not designed to operate with loads lower than specified. If the amplifer is being driven too hard this can lead to fuse failure although it will probably be a short some where in the speaker wiring or the voice coil or the speaker is on its way out shorting under high loads again causing fuse failure.
Further more if the amplifier has speaker protection which many modern ones do the trip circuit should switch the speakers off before a fuse blows, it could mean the output stage of the amplifier is faulty which means it can no longer handle full power output causing fuse failure.

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What probably happened was both of the final audio output transistors shorted. This caused a higher than normal drain on the switching transistors on the primary side of the torrid power transformer causing one to short and then blowing the fuse. I replaced both switching transistors and ramped up the current to about 5 amps. I could see the power supply was not working but there was still a short. I traced the short to both audio output transistors. Replaced them and unit is like new. After I found a service manual on this item it was a breeze to find the problem.

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Have a kenwood kac849 600w amp keep blowing fuse on amp as soon as power is too it power wire got wet and now this can i bypass that fuse some how

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.

Please, just take it in for service or get a new amplifier. That is the only sensible thing to do. The amp will not start working bypassing the fuse, it will only start smoking.

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I have this same problem. You have blown the internal amp. I have had 2 of these do the same thing. There is nothing you can do but report it to infinity and try to get the unit replaced.

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