Question about Alpine MRD-M1005 Car Audio Amplifier

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Volt signal is coming on

I am having a problem with this amp when I hook the amp up and turn it on, it says VLT in the display window?? no bass comes out the sub or nothing? Does any one know anything about this????????

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According to the owner's manual, this indicates that the input voltage (power supply) is too high. Assuming that the amplifier isn't defective, this might indicate a problem with the vehicle's alternator. Does the problem also occur with the engine off? Use a volt-meter and test the voltage at the amplifier's power terminals. With the engine running, you shouldn't see a voltage reading higher than 14.4 volts. If you see a significantly higher reading, it's time to have your vehicle's charging system checked. If the voltage is at 14.4 volts or lower, and the problem still occurs, then there's a defect in the amplifier.

Posted on Jul 02, 2007

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Posted on Jan 02, 2017

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1 Answer

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If the fault occurs even with the engine switched off , there is no reason of excess voltage but if the inverter DC-DC convertor within is faulty it can cause this error.
You can remove the covers and check for any visible signs of capacitor leak or burning. Unless the circuits are isolated the fault cannot be traced or confirmed. It can be a short in any of the regulators or drivers but has to be confirmed.

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The amp worked fine for about a year then one day the bass would not play through my subs properly sounding like a cd skipping only with the bass i would turn volume down and it would work fine until a...


When you hooked up your amp, did you hook it directly to the head unit so that it didn't come on with the car? Did you find the inline fuse in the amp positive cable? Few things to check..

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Wont turn on. everything should be connected properly, got new fuses to make sure. It worked fine until i dismounted and disconnected it from the battery. When i reconnected it, no luck it is a Autotek...


Make sure this high powered amp is not mounted directly to the chassis of the car. Mount it to a wooden board and you can screw board into the car. Because some very high powered amps can arc and damage itself.

Next make sure the tubular fuse in the hood is not bad it may look good but internally it got real hot and caused a bad solder connect in the fuse. You can test it with a meter. Measure one side then the other side if the 12 volt is going thru the fuse.

Next step is now you know your amp is getting 12 volts from the car battery but do you know if your amp turn on signal is turning on the amp itself. This is a easy test get a little wire and jump the 12 volt to the amp turn on wire if the amp comes on then you have found your problem. The amp turn on voltage is too weak were ever youve connected the signal. Normally you hook it up to the blue/white wire on the back of the radio first. If it doesnt have one hook up to the blue. Now on some very rare occassions the voltage drops when you put a load to it and is not enough to turn on your amp you can easily see this if the voltage across the blue wire goes below 12volts so hook it up to the red ignition wire so at least when you turn on your radio the red will send 12 volts to the amp to turn it on and will not drop in voltage. You see that wire has to be 12volts when it drops the amp will not turn on. Same with the battery Voltage you have to maintain 12 Volts or higher for the amp to operate.

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The radio on my 2003 Envoy quit working. The display on the radio says "need amp." A new amp was put in and the radio still does not work. What could be wrong?


Radio sends a 12V signal that switches on the amp which has it's own power suply but won't switch on till signaled from deck. Check to see if the amp is powering up.

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1 Answer

Sound is coming out but no bass


Make sure that the rca cables that you have coming out of the deck to the amp arent switched to highpass(no bass) and check the amp and make sure that the crossover is set to lowpass(LP) see if that helps

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you can find out on A15 pin for reset and B16 for clock .
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Cant figure out my car audio problems!!!!!


There are a couple of tests you can perform. I'd first recommend checking the shield ground. You'll need an ohm meter. The details can be found on the following page.

RCA shield ground test

You can also test the output with the multimeter. Set the multimeter to AC volts. If it's not an auto-ranging meter, set it to a voltage range of ~2v AC. Disconnect the RCA cables from the head unit. Touch one meter probe to the outer ring of the head unit's RCA jack. Touch the other probe to the metal contact in the center of the RCA jack. With the head unit near full volume and a clean signal source, you should read at least one volt on musical peaks. If you have a bass disc or a test tone disc (~60hz sine wave), use those.

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Is the master/slave switch set to master? Have you tried feeding the signal into a different amp to make sure that there is signal reaching the amp?

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