Question about Rockford Fosgate Punch P5002 Car Audio Amplifier

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Rockford Amp - When grounded, both power and thermal lights go off

Just like the title says, when I hook up the ground to my amp, both the thermal and power lights go off. When i remove the ground, they both light up again. I have done things in some of the wrong order, "had rcas in first", been connected to the battery and tested the ground at the back...but I don't think thats the problem. I am using 10 gauge wire for a 250 rms watt amp, and I just cant figure out why when I ground the amp, the lights go out. Please help!

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Well This is a interesting problem. In this amp chassis ground and Power supply ground should be the same. With no power applied measure resistance between amp's chassis and Ground terminal of amp. Should be Continuity (low resistance 1-2 ohms or less ) if not you have a burnt ground trace in the amp most likely because amp had poor ground to Ground terminal and was Drawing its current thru chassis or thru Rca Ground which I have seen happed on this amp in the past. F.Y.I I have repaired lots and lots of Rockford amps usually shorted mehsa bar (output / power supply rails) or burnt traces otherwise pretty tough amps. Questions kstahl65@att.net

Posted on Jan 11, 2008

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It sounds like an internal problem. you may have some power transistors that are shorted, but since this is a rockford they may be power MOSFETs instead.

Posted on Jan 07, 2008

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You shouldn't have the power wire connected to the amp without having the amp's ground terminal connected to a good ground. With some amps, it will damage the head unit.


Does the amp power up normally if you connect power and ground and then apply remote voltage (turn the head unit on)?

Posted on Dec 18, 2007

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1 Answer

I have a rockford p4004 and the protection light is staying on and am not getting anything out of the amp to my subs. what can i do. i hooked up a different amp to it and it worked fine.


The unit is internally grounded. Something has broken inside and grounding out the power, the amp will need to be serviced or trashed. Try calling Fosgate. They may have a serviceman or "fix it" department

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My Friend put A Rockford Fosgate P250.2 Amp in his car and while hooking it up he forgot to connect the ground but still got power to the amp but no sound from the subs and the thermal light is on. so he...


Your friend has damaged his amp. The power light coming on means that the amp's power indicator LED is at least working. That light is only there to tell you that the amp is receiving power on it's 12 volt rails, not that it's necessarily using the power in any way other than warming up the amp's internal circuitry. When you say the amp gets power, I'm not clear on whether you mean the amp works in that fashion, or there's just a red LED glowing but nothing else happens. The amp needs to be repaired, and I would suggest to him to not apply power to it again until it is checked by a professional. The power supply has probably been damaged, and it's possible, depending on how the amp was mounted, that it was searching for ground through the amp's chassis if it was screwed into metal at its mounting location. All that seems certain as of now is that the LED works, but nothing else, unfortunately.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/reginald_bec291de192ca44f

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Thermal light goes away when ground added


Doesn't sound like anything is wrong. If the thermal light is on before you have the ground hooked up then the amp is probably getting a small amount of electrical ground from the shielding on the RCAs or its mounting to the chassis of the vehicle allowing the amp to "barely turn on" (not enough ground). I can imagine this would make the amp think something is wrong (ie: thermal light) . May I suggest that you do not try to turn any amplifier on without ALL appropriate wires connected correctly.

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Rockford Fosgate T15004 The Amp still powers up with the


Check you inputs to verify you have a signal coming in, if signal then check outputs try a speaker that you know is working and plug it in if that speaker plays then the subs/ or speaker wiring is bad, if it doens't play then you probably have a blown output transistor on the amp or possibly a terminal ground/positive has come loose on the inside..

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Rockford P5002 amp problem with thermal light and low voltage


Hello rbenwalker,

The voltage drop may not be in the actual power wire itself. The same reading on both the B+ and remote terminal probably points to a bad or high resistance ground. Try a different ground point or make sure there isn't any corrosion, paint or anything else preventing metal to metal contact.

Hope this helps.

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Time to invest in a volt meter. A test light can show voltage and not actually be a 12+ volts.. A capacitor will store energy for yoy but first verify correct voltage.
A thumbs up would be greatly appreciated if this answer is helpful to you. rockford-fosgate-p-325-1-amplifier-peeu4x5nsxvd53n2rwetiqa4-1-0.jpeg

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Quick question, amp problem


make sure you ground wires arent shared, meaning run each ground wire from each amp to its own grounding point

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I have a Rockford Fosgate Puch 1000 watt amp "thermal" problem


With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.


If the voltage remains near or above 12v, disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up without the thermal LED being lit, the wiring needs to be checked. If it still indicates that it's in thermal protection, it needs to be serviced. A local repair shop will be the quickest. Rockford will email you the schematics.

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