Question about Rockford Fosgate Punch P4004 Car Audio Amplifier

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Spontaneously shorted, now blowing fuses on amp too.

About 2 days ago I got in my car and noticed that my two RF 10" subs were not hitting (this after almost a year of working well)(I don't know if this could have anything to do with it, but its been about 0 degrees here for a week or so and during that time I'd get a small audible pop from the back sometimes). I could get a few random bumps out of them if I cranked it up pretty high, but other than that nothing. I checked out the amp and when the volume is low, the emblem stayed lit (faded when the bass should have hit, then relit) but no sound from speakers. When I cranked it up, it would hit hard for a second then go into protect mode for a few seconds. At first I thought it was one of the subs because when I unhooked it, the other bridged channel & sub would work fine. But, I checked the resistance through the connectors for all 4 channels of the amp and one channel came back funky (the readings kept going up and up), not like the other 3 channels that all read someting like 4.35 ohm. That was the first problem. Next, I tried to hook it back up and now everytime I turn it on it blows the amp's two onboard 30amp fuses. I am using the same power lead and ground that was connected for the last year. When I removed the cover of the amp could I have screwed it up? I just used the ohmeter a couple places. Maybe something happened when I connected the power back to it? Is there a fix? or way to test for a fix? Time to get a new amp?

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Re: Spontaneously shorted, now blowing fuses on amp too.

Time to go to the repair shop. Sounds like you have a blown amp. Good luck.

Posted on Feb 22, 2007

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1 Answer

It keeps blowing a fuse

Generally, if you are using the manufactures fuse rating you can use a slightly higher rating and it will resolve the blowing fuses. Fuses supply resistance, if there isn't enough resistance you'll fry the system board in the amplifier. But if you have 25 amp fuses installed, install 30 amp, if you have 30 install 35 amp, 35 install 40. Anything higher will damage the amp.

Hope this helps.

A rare chance, something may be internally wrong with the amp and shorting it out which will blow the fuse.

Use the incorrect wiring of subs to the amp, you'll blow fuses and damage the amp from it turning off consistently. The amp should be running at 2 ohm stereo stable or 4 ohm mono stable.

Very few amps are designed to run at 1 ohm or less. Not to mention the subs can't handle it.

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Hello rheabarb,

You did not say whether or not you checked the wiring going to your subs. Many times, a shorted or grounded speaker wire will cause an amp to fail. And if the amp powers up OK with the subs disconnected, I'd suspect one or more of the wires.

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good day, check your spkr impedance, if 4oms use a posive spkr dividing network. if stills blows up replace a higher amperage of your fuse. ex.4A raise it up to 5A. the your amps consume higier current if more spkr wattage.

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Sounds like a short circut protection on the amp kicking in. It sences the power going to the drivers and cuts itself out before damage is inflicted on the subs.

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