Question about MTX Thunder 421D Car Audio Amplifier

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MTX Thunder problem

Have been using this MTX Thunder 421D amplifier for about 3 years and it just all the sudden stopped working and isn't powering on anymore. Check both 20 amp fuses and they are good.

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Make sure that your connection at the battery is still good-sometimes the wire corrodes up front when your system is installed for a long time-so check that out and of course the fuse that you installed a foot away from the battery so that you dont burn your vehicle down if a short occurs somewhere down the line

Posted on Jun 04, 2009

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Posted on Jan 02, 2017

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My mtx thunder 421d I just got has the red light staying on all the time, I have hooked up a rca converter and the amp wont play my sub, is that light supposed to be red all the time.


The LED should be red. If you are not getting power to the sub, make sure the speakers are connected properly to the amp. Also make sure that the gain control is turned up. If it is all the way down, you will not hear anything from the sub(s). If none of that works, it is possible that you have a blown sub. If you smell a burnt smell near the speaker magnet, there is damage to the voice coil in the sub.

Feb 25, 2011 | MTX Thunder 421D Car Audio Amplifier

1 Answer

My red light stay on all the time


Check your wiring and see that your power wire is not in contact with any part of the body of the car. I also recommend soldering the ends of all wires, to prevent them from splitting especially on the amp terminals.

May 26, 2010 | MTX Thunder 421D Car Audio Amplifier

1 Answer

Blown Voltage regulators


that first number most likely is 2N414A. Goto NTE cross refference web site and put this number in, it will show you a cross for it with a picture of the transistor to match it to the one you have. Hope this helps good luck.

May 24, 2010 | MTX Thunder 421D Car Audio Amplifier

1 Answer

I have a mtx thunder 421d. I've had it about 5 years,about a week ago it started going out from time to time. I checked my hot wire and fuses,they are ok.Now the amp stop working, and dont light up. Will...


If you have proof of purchase(invoice or receipt) showing the purchase date and you are still within the warranty period then yes it would be repaired by MTX under the warranty guidlines, and by the way MTX is great at customer service and they are great to work with(very fair)!!!!
Keep in mind that the seal on the bottom of the amp cannot be broken or that will void warranty coverage.
Give them a call, you will be glad you did!
800 225 5689 - MTX Customer Service & Amplifier Service Center
Good luck !

Jan 31, 2010 | MTX Thunder 421D Car Audio Amplifier

1 Answer

Sub not working and red light on amp stays on?


the amp is under to much pressure get a bigger 1

Nov 18, 2009 | MTX Thunder 421D Car Audio Amplifier

1 Answer

I have a mtx 421d. can I over heat if I connect only one channel.


Hello jaimemm_77,

The MTX 421d is a mono amp. It only has one output channel.

If you are asking about hooking up only one channel to the input, then no, the amp will not overheat. But the output will be significantly reduced. It would be best to use a "Y" adapter with a single female and two male connectors to split the channel into both inputs.

Hope this helps.

Jun 16, 2009 | MTX Thunder 421D Car Audio Amplifier

1 Answer

30 fuse keeps blowinn


that means that you have a short in the power supply or in the output circuit.

May 21, 2009 | MTX Thunder 421D Car Audio Amplifier

1 Answer

Amp turns off when head unit is playing cds


Connect the remote turn on to the blue wire w/white stripe coming from the head unit, NOT the solid blue wire which is the antenna turn on.

Oct 28, 2006 | MTX Thunder 421D Car Audio Amplifier

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