Question about Rockford Fosgate P3001 Car Audio Amplifier

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Amplifier The rca cables are grounding the amp and when I take the rca cables out and put the ground on the amp will not turn on. Everything else is hooked up right, the system is only a year an half old. I did take the amp fuse out and the positive battery cable off and then put the ground on first and then put the amp fuse in and then put the battery cable back on and it still does the same thing. Can somebody help me please?

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Re: amplifier

Then it's a bad ground. Where did you ground the ground cable to? Is it tight, free of rust, clean, and most importanly, bare metal and free of paint?

Posted on Nov 02, 2006

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Hav a pioneer deh p80 mp. when my amp and is connected to the stereo and the car is turned on. there is humming noise and the sound of the engine come out from my sub. and this dont go away until i turn...

Hello M8

lots of things can do this and the installation is the most common issue.

some simple rules:

never install the powercable and RCA cables together on the same side of the car.

keep the rca cables as far as possible from other wires if possible.

ground cable not grounded propably (Clean metal surface on chassi)

bad RCA cables eg: broken/Loose (Use shielded cables)

use the same diameter on both possitive and negative powercable

it could be a problem with either amp or sterio too if everything above is ok

Sep 05, 2011 | Car Amplifiers

1 Answer

I wanna put it into my car myself but dont know how and was hoping for a lil instruction

you will need a amp install kit witch comes with a 15 ft patch cable power line for amp and a blue line for remote. these wires run from the radio to the amp. The blue wire is called remote it turns the amp on or off depending on the radio state. the patch cable is rca jacks on both ends the back of the radio should have the female part of the rca jacks hanging from it. The other end goes into the amp. and last but not least the heavy red wire will go from the battery to the amp usually there is a fuse holder that you need to put between the battery and the amp. As far as grounding just ground the amps negative to the car chasis some where.

Good Luck Hope this helps

May 04, 2011 | Visonik Dual Bass Box with Amplifier Car...

1 Answer

I have a alpine mrp-m500 for about two years no problems at all. but one day it stops producing sound. i check all fuse on the whole system. is the a protect mode? and how do get it out of it?

If you have checked all the fuses.
Trace your ground wire that goes to the frame. It may be possible your ground is no longer grounded properly. You may just need to unhook the fuse from the battery, Unhook the ground wire from the chassis and restrip, put on a new connector, chisel off the paint around where the amp was grounded to and tighten it back down. Hook back up your fuse to the battery and check and see if it removes the protect light.
Also check to make sure your RCA cables aren't bad. If the RCA cables ground it'll put the amp into protect mode too. Basically just switch out the RCA cables for a good pair.
If the remote wire on the amp is touching the ground, it'll throw the protect light too. That's pretty much the extent, unless the amp has a short inside it.

Hope this helps!

Jul 26, 2010 | Alpine MRD-M500 Car Audio Amplifier

1 Answer

RCA amp problem

You have a ground fault. Check all ground wires and then make sure the rca cables are not broken in any places. If everything is good there is a ground fault inside the amp.

Jul 20, 2010 | RCA (RC1000A) Car Audio Amplifier

2 Answers

Noise in my car amp.

sounds like you have a bad ground going to your rca's. try running a wire from ground to the shield of your rcas and see if the noise goes away.

Apr 19, 2009 | Rockford Fosgate Power 1050S Car Audio...

2 Answers

Amp light is neither green or red

have u connectted the remote wire from head unit to turn amp on? have u got + and - the rite way round.hope this of use.

Mar 05, 2009 | Power Acoustik PS2-1250 Car Audio...

1 Answer

Red light stays on no sound. rca cable grnd, must be connected?

What do you mean the RCA cables are'nt grounded? All RCA cable have a ground. What kind are you using? The round metal at the end of the RCA cable is the ground. The silver or outside of the line input on the amp is the ground for the RCA cables. Anyway, that would'nt stop your amp from coming on. I suggest you take a piece of wire and ground it to the amp and touch the metal piece on the RCA cable and see if you get sound. Even if the RCA cable is'nt grounded you would get some type of sound coming out of the amp maybe. If you do it will sound like it's cominf thru a long tunnel, like a reverb effect. I have never heard of an RCA cable not having a ground. ARE you sure you have RCA cables? Let me know and send me a pic if you can of the input of the amp so I can see how you have it hooked up.

Jan 07, 2009 | Kenwood KAC-9152D Car Audio Amplifier

2 Answers

Protect Mode with RCA's

It sounds like you have some DC voltage on the RCA input.

You need to figure out if the problem is coming from the head unit or if it is in the amplifier.

If you have a voltage meter, you can use it to find out very quickly.

Set the meter for DC and for a max level of more than 12 volts. Most meters I use have a 30 volt level. That would be a good setting.

Take the black lead and make sure it is grounded to the chassis of the car or to the ground of the power terminal, be careful and make sure it does not touch anything else.

With the RCA cable disconnected put the red lead on the inner part of the RCA cable and see if there is any DC voltage and then check the ground or outer part of the cable. Do the same for the other channel as well.

It should be very close to zero volts. A couple of millivolts is fine to. Any voltage here will cause the amplifier to go into protect mode, which is what is happening to you. You will then need to have the head unit serviced.

If you have a Pioneer head unit, I have seen many of them with an open ground fuse for the RCA jack. That fuse is a surface mounted fuse and is very small and hard to locate on the main board of the radio. If you do have a Pioneer head unit the voltage may seem OK, but you will have an open ground, but that normally does not put the amp into protect. It makes the audio sound very weak and you would have a loud hum. I can help you with that if it turns out to be the problem.

If the voltage on both the RCA leads is OK, then you need to check the amplifier.

You can put the meter lead on the ground of the RCA jack on the amplifier, if you have anything abnormal there, you have a problem in the amplifier. Be careful checking this because you can easily touch the lead to the chassis of the amplifier at the same time as the RCA ground. Most of the time, if yu have a problem in the amplifier like the one you are having, this check of the RCA ground will result in some DC voltage on it. If it still checks OK, then put the lead into the RCA ground and check the positive part of it. You may need to move the lead around a little to get it to touch the metal inside, it is on the bottom part of the hole inside the jack.

I think you will find that you have some voltage on the RCA inputs of the amplifier. To fix this properly you will need to take it in to be serviced.

Sometimes you can ground the RCA jack ground somehow with a jumper wire and then turn the system on with the RCA cable plugged in and it will seem normal. But you do not want to do that as a repair, only to see if the amp will play. If it does play, you know that the problem is in the pre-amp of the amplifier. That would be the only reason to connect an external ground to the RCA jack. You still have a problem in the amplifier. If it does not play normal, you still have a problem in the amplifier if there was some DC on the RCA jack.

Sorry this answer is so long, but the problem you are having will require service of one of your units, you just need to know which one it is. If your inputs get grounded, you will not have the amp go into protect, you just won't hear anything.

Let me know if you need more help and if this was helpful to you a good rating is always appreciated.

Jun 22, 2008 | Power Acoustik TS1440-2 Car Audio...

1 Answer

Protection light turn on with sound

It's likely that the amp is defective but you should check the shield ground of the RCA signal cables before sending the amp off for repair.


Disconnect the RCA cables from the amp.


With your multimeter set to ohms, measure the resistance from the outer shield of the RCA cable to chassis ground. If it's more than a few ohms, that could be causing your problem.


If this is higher than a few ohms, short the meter's leads together to make sure the meter will go down to 0 ohms.


To check the shield ground of the head unit (assuming that the head unit is driving the amp directly), disconnect the RCA cables from the head unit and measure the resistance from the RCA output shield to the case of the head unit. It should essentially read 0 ohms.



Oct 21, 2007 | Cerwin Vega XL 600.1 Car Audio Amplifier

1 Answer

Amp cuts off

So you have an EQ and a Pioneer amp you're trying to hook up to each other? And only some Stinger RCA cable works? And when the lightning audio RCA cable is hooked up, it doesn't turn on? The amp isn't grounding itself through the RCA cables, is it? Check your ground wire and make sure it has a clean contact that's free of rust or any paint that might be in the way. Otherwise, the RCA cables should have nothing to do with an amp turning on or not.

May 07, 2006 | Pioneer GM-X324 Car Audio Amplifier

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