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My mtx TNA251keeps going into protect mode after i put the speaker wires in

Posted by Derek Brackett on


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You have a short somewhere in the speaker wires.

Posted on Oct 04, 2016

  • Derek Brackett Oct 05, 2016

    Like where? Its all brand new wire? Today i took the amp to my buddies house just to see if the amp was bad or to just see if it worked with his set-up and she played like a charm......i go to put it back in my pickup and she goes right back to protection so lost......have had professional installer look at it yesterday and he said the amp was like 12 hrs into testing and checking again and the trouble shooting bit im running out of the easyones to try.......



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SOURCE: legacy amp in protect mode

What was the part number on the transistor you replaced?

Posted on Dec 15, 2007



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SOURCE: sub will drain all the sound off the front speakers

if you have both amps connected to the same power wire this will another power wire to the alpine and this should solve the problem.

Posted on Jul 25, 2009


  • 7 Answers

SOURCE: my amp keeps going into protect

if your amp is a 2 channel you might be using the left positive and right negative or vise-versa. check and make sure your only using right or left and not both, as it will cause your amp to go into protect

Posted on Mar 17, 2010

SOURCE: my mtx 502 was going into protection mode, but now
service manual for troubleshooting -

Above, is how to troubleshoot, protection problems.

Posted on Mar 28, 2010

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1 Answer

Amp going into safe mode acts like its not getting enof power, power and ground are both 4 gage and hooked up corectly

Check the speaker wireing that it is not off somewhere ,or pinch.End shorting out. If all that is okay. It is not wired up properly to the sub or what ever speakers you have hooked up to it, Or you don,t have it set up (Poperly) They do not go into the protect mode For nothing,Unless you are trying to wire up your sub or (Speakers) To lower ohms then what it is stable for.If that is the case your lucky that it hasn,t went up in smoke yet,End that is not covered buy any manufacturs Warrenty,

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Tc 8001 red light

on some amps there is a duel light. red and green usually. red means it is in protect mode or you didn't hook up your remote wire. if in protect mode, it could mean a number of things. did you hook it up with speakers and everything?

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I have a 600 w amp with 2 10" mtx audio subs. When my amp goes to kick in it goes into protection mode?

you have the speaker wires wrong + to - o - to + put make shoore speaker wire is in place .

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I just got a mtx thunder 6152 amp got it all hooked up its working but red light is on, should it be red or green? .... go to this link for more help, it is the owners manual

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Why do my mtx 8100d amp keep cuting off

wrong wiring for the speakers. to low of an ohm load so amp is going into protect mode. rewire to 4 ohm stereo.

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1 Answer

I have an mtx amplifier. it worked for a while then it just cut out, still turns on, no blown fuses, no smoke or funny smell, speakers work. what could be wrong with it

Looking at alot of the unsolved FixYa problems - I can see alot of "My amplifier is going into protect mode - How do I fix it?"

There is no catch all or simple answer. Troubleshooting2.gif steps must be taken to determine what is causing the problem.

It is one of 3 things....

1. Impedence under rated value or Thermal Protection.
2. Short to ground in wiring.
3. Internal Component Failure.

One of the more confusing things with a car stereo can be when the amplifier goes into protection mode. One minute it's working and the next minute it's not. Here's a brief troubleshooting method that will hopefully help you if your amplifiers ever go into protection.

1. Try to determine the cause. Amps2.gif can go into protection mode for several reasons. Knowing what happened before it cut out can help determine how to fix it.
Did the amp not work as soon as it was turned on?
Did it happen after blasting for hours (may be thermal overload and it needs to cool)?
Did it cut out after you hit a bump (a wire connection may have come loose)?

2. Tear it down. Get the amp down to it's most basic state. Remove all of the speaker wiring and RCA wiring and leave only the power, ground and remote leads connected. If you still have a problem in this state then either your amp is defective or you may have an installation problem such as the amp touching metal.

Remember that an amplifier2.gif should only be connected to the vehicle through the power and ground terminals. Mounting the amplifier to the metal of the vehicle, including putting the mounting screws into metal, can cause problems for your amplifier.

Always mount the amplifier to a non-conductive surface. An easy way to accomplish this is to mount the amplifier to a wood board and then mount the board to the vehicle.

3. If the amp is OK in this torn down state keep adding the other wires back on until you find what causes the problem.
Add the RCA cables first.
Then add the speaker wires one at a time.
If the speaker wires cause the problem then they are probably touching metal or have a blown voicecoil.
Check to make sure that a speaker wire isn't being pinched somewhere between the amp and the speaker.
Also check that the speaker wire or speaker terminals aren't touching the vehicle metal near the speaker opening.
Rear decks and door panels can easily touch unprotected speaker terminals if not properly installed.

If the problem starts occuring when you connect the subwoofer wires to the amplifier you may have your subwoofers wired at too low an impedence. First check the spec's on your amplifier to make sure what kind of loads it is stable under. Then check the wiring configuration to make sure that your load is not too low:

If you believe your amplifier is defective contact the manufacturer first. Many have flat repair rates that are very affordable and cover parts and labor.

However local repair shops may be cheaper if it is just a small repair.

Compare the manufacturer's repair rate to that of a local shop. If you don't know the reputation of the local shop it may be better to send it to the manufacturer who will have working knowledge of the amp and parts readily available.

Thanks for using FixYa - a 4 THUNMS rating is appreciated for answering your FREE question.

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1 Answer

Green light (protection mode) on, NO red light (ready)

double check your wires aren't shorting out or power or remote wires aren't grounding. check if speakers are blown with nine volt battery

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1 Answer

I have a TN250/1 MTX class D, mono-block amp, protection light comes on and thats it. Whats the problem?

Two things, a problem with the speakers, or the amp is toast. If there is a short is the speaker, wire touching, bad voice coil, the amp will go into protect. I have also seen many, many MTX amps that go bad, and just stay in protect. the easiest way to check, is to unhook the speaker wire from the amp, then power it up, if it still goes into protect without a speaker hooked to it, you have a bad amp. Hope this helps.

Aug 17, 2009 | Car Audio & Video

1 Answer

When i hook up my amp. i have all my wires hooked up right,

this is a signal crash either your speaker wires are crossed (wrong wiring phase) or your RCA jacks need replacing also it could be inside your amp the solder lines may have fused. If after checking and replacing wiring problem persists return to MTX for repair.

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