Question about MTX Thunder 2-Channel Amplifier 502 Car Audio Amplifier

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Won't power on, but blade fuses are ok,

My amp just stoppped work and all the blade fuses are ok and I have checked that all the wireing is correct and it is. I pulled the cover off to look with a pen light tester, and I think that 2 out of 3 of the small black resisters/capacitators/fuses or what ever they are are shot because only the outside one will light up the pen light, are the other two supposed to work simultaniously to the outside, and is it worth it to track down replacements and have someone fix it?

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Re: Won't power on, but blade fuses are ok,

I dont know about the resisters but i had that proublem and it might seem to easy but check your remote wire coming off the deck (cd player)

Posted on Jul 02, 2007

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No sound but it does power up worked ok before think a wire came off in sub

take a multi tester and test the + and - of the amp if there is power Check the fuses. if that is ok it means that the power IC on the amp Blew.

May 05, 2011 | Alpine PLT-5 250W Powered Truck L.A.T Sub...

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Amp and subs working one day the next day their not working can not find out way

Check your power to the amp. your 12volts battery and the remote from radio which should be another 12volts and make sure you are grounded correctly. If everything checks out Ok with the power and ground then check your amp fuse.

Apr 17, 2010 | Car Amplifiers

2 Answers

Amp blows fuses

Are you using the correct fuse? if so,
more then likely, you don't have a good ground. Try grounding to something else that has more direct connection to your frame. If that doesnt work, try getting larger power cables.
I had the same problem with my 2500w xplodes all I had to do was get a thicker cable for the ground and battery connection. What was happening, was it was needing more power then the wire and fuse could handle, so it would blow the fuse, since the higher you have it, the more power it needs to feed the watts.
I would try grounding it directly to the frame on a good part of the frame before spending another $70 on new power cables though.

Mar 09, 2010 | Car Amplifiers

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Protect mode on. All wiring is operative without incident. Power and all is working, but will not come out of protect mode and all fuses are brand new.

it could be one (or more) of several issues. ensure none of the speaker wires are connected to the ground of the car, or to each other. ensure the speakers are not blown. check to see if the amp comes on ok without the speaker wires hooked up. your battery may be low - check voltage at the power terminals of the amplifier to ensure you have operational voltage. you may not have a sufficient ground connection - ensure the ground wire is less than 18 inches, is of proper gauge (minimum 10 gauge, the lower the gauge the better), and is connected to a sturdy connection going right to the ground plane of the car - make sure the paint is scraped off from under the point at which the ground wire terminal is screwed to the ground.

Jan 17, 2010 | Boss Exxtreme BLX5000 2-Channel Amp -...

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Amp worked shortly, now no power

It sounds like you clipped the amp and did damage to It and possibly the speakers. I would check all connections and wires first. If you used too light of wire you may have either burnt the insulation off or burned through the wire. High power amps need large power cables. If thats all ok, did you have a fuse from the pos power terminal? Check that. If every fuse is good and the connection are good then it sounds like you may have blown an internal component in the amp such as a Transistor, Diode, or Capacitor. This would mean taking it to a service facility.

Jul 19, 2009 | Car Amplifiers

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No sound coming from sub woofers amp is connected and powered properly,all connections are correct,i have checked all connections to head unit,to battery i have disconnected and re connected all...

check your amp fuse also any car fuses, then check inside the sub box at the connections as they dont come connected when you buy it, try that 1st

Jul 11, 2009 | Car Amplifiers

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I got an amp and as soon as i put the fuse in it blows even with the deck of all wiring is correct and i hear a thump from the subs when i put the fuse in, the subs work good on a diff amp

Sounds like the amp is blown. Is it the fuse at the amp that blows? or the one at your battery? disconnect the ground and power wires from the amp and check for continuity between the ground and power on the amp terminals. you should have no continuity, and if you do i would check for a shorted power supply mosfet. try disconnecting all speaker wires, rca's, and remote power and see if it still blows. If it does its a problem in the amp, probably blown mosfets.

Jun 30, 2009 | Car Amplifiers

2 Answers

Amp keeps blowin the two 30amp fuses on the amp.

Make sure that the speaker wires are wired correct at both the amp and the speakers......otherwise it sounds like the typical death of a power acoustik amp (great amps, but prone to a premature death)

Mar 29, 2009 | Power Acoustik GOTHIC OV2-1200 Car Audio...

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Protect at high volume

No such thing as too much power unless you have a faulty alternator/voltage regulator.
The hundred amp fuse at the battery is better than none but I would replace it with a 50 Amp, that fuse is really only protecting the power wire from grounding out and burning.

The gains are irrelevant, all they do is attenuate the input.
Set them so you cant hear any amp hiss or noise on quiet passages of music or between tracks.

Make sure your not starving the amp for power. Start at the battery connections and work your way back to the amp, inspect all connections for corrosion and make sure they are tight.
Check the ground wire . It is just as important as the power wire!! Try to ground it as close to the amp as practical, scrape off the paint down to the metal use a oversize screw with a star lock washer and a ring terminal.
Make sure that your power wire and ground are at least 8 gauge.

Next on the list is your speakers and related wiring, check to make sure that your impedence is not too low for the amps rating. and that the wiring is correct and at least 16 gauge, 12 is better.
. You can check the speakers impedance with a Ohmmeter, it wont be exact but it should be close +/- .5 Ohm If you are bridging, make sure the speakers are wired in parallel + with+ and - with - .check the amps rating and bridging configuration, it's normally left positive, right negative, but check!

Having done all the above, and you still have a problem only two possibility's left, Defective speakers or the amp. Check with a qualified installer, buy him lunch, you'll get good advice forever.
I hope it helps. Regards Paul

Jun 11, 2008 | Lanzar VIBE266 Car Audio Amplifier

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