Question about Rockford Fosgate Punch P5002 Car Audio Amplifier

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P5002 Problem The owner mistakenly connected the (-) on one stereo output to the (+) on the other stereo output throught a 4 ohm speaker load when attempting to bridge the two outputs. The main battery fuse blew and now there is no output from either stereo connection. The power supply fuses did not blow. Would the problem most likely be the power mosfets? There is no visible evidence of burning or damage. Is there a schematic available for the P5002? Any assistance is appreciated. Thank You

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Re: P5002 Problem

The schematic is available from Rockford.

It's possible that the outputs have blown. They generally short from the center leg to the third leg when they fail.

Unless you have experience working with the MEHSA insulators, you may want to buy the entire MEHSA strip from Rockford. You can replace the transistors on the insulators but you have to use a torch to heat the strips.

Posted on Nov 18, 2007

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It has an A and B channel for spkrs and i have one spkr bridged. do i split the neg to side a and pos to side b or just use one of the channels?

Could you elaborate on how the speaker is bridged?

I think you want to hook up a single speaker to a stereo speaker output.

In this case, you would strap (bridge?) the right and left speaker terminals by running a short wire from A right negative to A left negative. Then strap A right positive to A left positive -- this will give you mono output on either of the right or left speaker terminals -- connect your speaker to either one of these.

Do you know what the ohm rating is for the speaker outs on the amp and also the speaker itself?


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Hello umbaftroml,

Here's a link to the owners manual: Scroll down to the B4.250.2 and right click "Download Manual".*&p_li=

You'll need some source of 12V DC power which is not available on your home stereo. A 12V battery or DC power supply will work OK. You'll also need to wire in a toggle switch to "trigger" the amp to turn on. Just put the toggle switch inline with a diode for isolation between the power wire and the "remote" terminal on the amp. Flip the toggle on when you need to use the amp.

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Pretty Straight Forward get a 8 or 4 gauge amp wiring kit.

Run your hot wire to the +12V from the battery make sure to install the supplied inline fuse near the battery don't connect to the battery until installation is complete.

Run the REM to your stereo power ant. Wire. if available.

Run the GND to Metal Chassis Ground keep it as short as possible.

Run the RCA Cable from the back of the Stereo to the RCA Inputs or Low Level on the amp.

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You probably have the output bridged at 2 ohms. This amp is not a 2 ohm bridged stable amp. It is 2 ohm stable only in stereo. That means each channel can be 2 ohms, buts not bridged at 2 ohms.

If you have two 4 ohm speakers that are wired in parallel and then you bridge them, you have a 2 ohm load.

They only safe way to use two 4 ohm speakers is to run one speaker to each channel and then you have a stereo 4 ohm load.

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If this is the case, you should go and get your speakers checked and see if they are still measuring at 4 ohms or at least close to it. Most speakers will measure a little lower than what the are rated. It is not unusual for a 4 ohm speaker to measure at 3.5 ohms, but if it is less than that, you problem is the speaker. Even if the speaker still plays.

I hope this was helpful for you, if you require any further help just ask.

If you did find that this was helpful in solving your problem, I would really appreciate a good rating.
Thanks and have a great day,

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