Rockford Fosgate P3001 Car Audio Amplifier Logo

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Posted on Jul 02, 2017
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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 connected the ground but now the amp wont turn on with the ground connected but it does get power with out a ground. what is caused it to turn the thermal light on and why is it getting power without a ground but not get power with one/

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  • Expert 40 Answers
  • Posted on Jul 08, 2017
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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.

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5 Related Answers

zzedly

Tygh Duval

  • 300 Answers
  • Posted on Jun 20, 2008

SOURCE: sub hook ups

There's a lot more factors involved than that.

  • Power capability of the subs
  • Type/size of the sub box
  • Allotted space in the vehicle for the sub box
  • Voice coil impedance of the subs versus the capability of the amp
  • Etc.

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jcbproducts

  • 4 Answers
  • Posted on Dec 03, 2008

SOURCE: How much would installing a headunit, amp, and subs usually cost?

hows it going so you need it to be installed or you can install this yourself? well the best bet fund to get stuff done cheap is t get the stuf you will need to do an install like a install wiring kit and tools and post a installer help on craigslist.org iin your local area would be the cheapest way or just go to your local audio stereo shop thanks again and i hoope this help have any more questions please feel free to contact me if you need a step by step install i can help you in that and save you big bucks thanks again. always forward jcbproducts

Robert marquette

  • 102 Answers
  • Posted on Apr 12, 2009

SOURCE: amp only has red thermal light on. some times the

Please review your wiring, both INPUT and OUTPUT

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_aad3edb7dfa380b9

Anonymous

  • 15935 Answers
  • Posted on Apr 25, 2009

SOURCE: not a problem just a question

  • 100 watts RMS x 2 at 4 ohms
  • 200 watts RMS x 2 at 2 ohms
  • 400 watts RMS x 1 at 4 ohms in bridged mode
  • stereo or bridged mono output
  • 4-ohm stable in bridged mode
  • Tri-Way capable
  • requires 8-gauge power and ground leads — wiring and hardware not included with amplifier
  • 50-250 Hz high-pass/low-pass (12 dB/octave) crossovers
  • wired remote included for fingertip control of Punch Bass (0-18 dB boost at 45 Hz)
  • MOSFET power supply and output devices
  • MEHSA mounting technology increases the heat transfer from the MOSFET output devices to the heat sink, for higher power output, lower operating temperatures, and greater reliability
  • TOPAZ — noise-killing differential inputs that eliminate 80% of ground loop noise
  • Trans•ana circuitry keeps preamp voltages low and signal paths simple for outstanding audio quality
  • NOMAD — advanced protection circuitry for "intelligent" shutdown protection
  • speaker- and preamp-level inputs
  • 11-1/8"W x 2-3/8"H x 9-7/8"D


  • Wire your sub in bridged mode (4 ohm mono)
    + to + on amplifier
    - to - on amplifier
    (using bridging terminals)

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    Anonymous

    • 10 Answers
    • Posted on Jan 19, 2010

    SOURCE: how do I hook up one sub to my rockford fosgate p3001 amp

    Hey i have looked over many rockford manuals,(i own a 300.1 my buddy owns a 325.1) and for there mono(.1) amps there hooked together on the inside so channel A+ and B + are cencted on the inside the amp. So you ither hook one 2ohm sub to channel A or you can hook 1 4ohm subs to channel A and 1 4ohm sub to channel B. There 2ohm stable so any lower will eventualy burn the amp out.

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