Question about Rockford Fosgate Power 1051S Car Audio Amplifier

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802 rockford Fosgate amp

Hooked up amp the led comes on when the rca wire is in but no sound comes out Led fades out slowly. All fuses are good remote wire has power power wire has good power. work great in other car but can't get it to work in my new car same deck wire etc. if have any tips please help.

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  • Jamie Reinhart Apr 22, 2007

    I had to put a heavier ground wire in and relocated it to a better spot. who would think that it would be that simple



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Posted on Jan 02, 2017

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SOURCE: Rockford fosgate 800 a2 amp power?

Hello desperate2le,

Watts delivered is a function of the voltage times the current. If the amp was 100 percent efficient, it would need 33 amps at 12V for 400 watts. At 14.4V, it would only need 28 amps. Of course, amplifiers are NOT 100 percent efficient, only about 50-60 percent in many cases, but somewhat higher for monoblocks, maybe 80-90 percent. So you're looking at a fuse in the 60-80A range. In the absense of a specific fuse size from the manufacturer, I'd start the primary fuse at a 60A and if the amp blows it on power up/immediately/frequently, move up to an 80A.

All of the Rockford-Fosgate 2-channel bridgeables I've ever seen show using the left positive (+) and the right negative (-) for bridging. But if it's not shown right on the amp, I'd call or email RF for the correct connection. The new amps do show it.

Hope this helps.

Posted on Apr 28, 2009

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SOURCE: 401s Rockford Fosgate Amp. Not powering on,just protect lite is on.

the problem is mostly with your audio side of the amp. i have a 800 Rockford punch series amp hooked in series running at about 15 vdc at 2 ohms stable for now. but the amps left front power side transistors overloaded and smoked out, i will be replaceing my mosfets soon. Now on that side your issues apear to be related to the signal side of the amp. when you hooked the amp up tell me breifly did you hook the rca inputs to the back of the sterio and did you select the proper rca inputs for the amp? also note that amps have a potentiomater that can be tuned up or down to allow the volume or wattage to go up or down threw the system. if it's turned all the way down you'll here nothing. but often you'll get a pop sound or quickly see the speaker move a bit. this indicated the signal side of the amp has signal comming in but no output, just look for a turnable small screw inside the amp top or side. and turn up acordingly. note: to much output will damadge your system. not just the amp. ;)

Posted on Aug 28, 2009

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SOURCE: rockford fosgate 450.4. 1st protect mode, now blows fuses...

smell it !

Posted on Oct 13, 2009

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SOURCE: Rockford Fosgate Punch 401s starts then smokes

Can somebody email me the schematic for the Rockford Fosgate 401S?

Posted on Apr 29, 2010

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My fosgate amp was workin an now it wont trun on can u help me out plzzzzz.....thanx for ur time...

First check your fuses, all fuses. Then check to see if it's getting voltage to it, look to see if any of the LEDs are lit up, power, protection (over /under voltage, overload (short)) or none. If the power LED is lit & no others then check your RCAs coming into the amp by replacing them or using a multimeter set to ohms to make sure they are not loosing a connection due to wire breakage inside the casing. Cheap RCA's will easily disconnect inside the plug just from twisting them. If they are good and are not disconnected from the head unit, then check your speakers for damaged coils or loose wires, who knows they may have fallen off? If your amp has more than just power LED lit then you may have a short in your speakers or wiring disconnect the wires to see if the protection LED goes away. if not and it's still lit then repair the amp. If there are no LEDs lit at all, check your remote turn on wire from your head unit to make sure it sends out a 12 volt signal to the amp. You can also jumper a wire from the 12v battery connection over to the remote turn on connection to see if it will power up. If not then check power wires and connections, fuses, Battery , alternator, voltage regulator, etc.. any thing that has to do with your cars electrical system may have fried from the current draw by your amp.

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When i put power to it i dosent turn on or the led light dosent come on

do you have the remote power wire hooked up next to the battry wire ,have you checked the fuse and do you have a good ground

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I have a 1400 watt cruch amp & i hooked it up myself. when i turn the radio on the power wire on the amp comes on, bt if the audio cords are hooked up, the protection light comes on. if i dnt hook the...

Should the amplifier go into protect mode, simply disconnect all RCA and speaker leads, while keeping +12 volt, power ground and remote leads connected.

1. Now turn the amplifier back on, and if the diagnostic LED lights, the amplifier has an internal fault.

2. If not, plug the RCA cables back, and reset the amplifier. If it goes into diagnostic now, the fault lies in the input, either with bad cables or source unit.

3. If the amplifier seems fine with RCA cables plugged in, connect the speakers, one at a time, and if one of the speakers or its wiring is faulty, it will activate the diagnostic

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I have checked all connections to my amp battery,head unit,remote or trigger wire,fuses,power cable,rca leads,ground wire,amp has a green led light on it indicating if it works ok,red if it`s not,light...

Your amp could be in protection mode! Sometimes turning up to high or wires touching will put in protection mode! It will have to be unplugged for a day or two to drain all power out of the memory. Leave accessorie/ignition wire hooked up, just not power and ground wiring. It should reset itself.

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You should verify some other way (with a multimeter or another amp/device) that your 12V is working at the amp. Then to troubleshoot the Remote wire, take a short lead of scrap wire and run it from the 12V power input of the amp over to the Remote input like a jumper. If the amp still doesn't power up, then look for and check the fuse on the amp. If there's good power at the amp, the remote input has good power, and the amp doesn't turn on, and the fuse isn't blown, then the amp is probably toast. Good luck!

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401s Rockford Fosgate Amp. Not powering on,just protect lite is on.

try hooking the remote wire to a rem wire on the back of stereo. post and let me know results

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