Question about Alpine MRV-F345 Car Audio Amplifier

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VLT Error Hi everytime i connect my amp to my 12V battery or a 13.8V AC to DC power inverter my amp displays VLT which is supposed to indicate too high a voltage but the display still reads around 12 volts or 13.8 volts when on the inverter?? plz help

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Re: VLT Error

Change battery never worked i put it in my friends car and is still the same

Posted on Apr 22, 2008

Re: VLT Error

Did you get your amp fixed i have same if you can

Posted on Apr 21, 2008

Re: VLT Error

Chenge battery

Posted on Sep 29, 2007

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Alpine 345 amp flashes VLT

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.

Dec 23, 2011 | Alpine Car Amplifiers

1 Answer

Kicker zx1000.1 stopped working completely. I have 3 Kicker 10" cv subs hooked to it. The first time it shut off I turned the system off. When I turned it back on it worked for a few minutes and...

First check to see if your'e getting power to the amp by using a test light and touch the main power(12V battery) connector on the amp, test light should come on since it's constant 12v supply. Now turn on the radio and test the remote wire connector on the amp and you should have 12V(test light should come on). Also make sure that you have a good connection with your ground wire, check both connection points to make sure it's good. Now if you have power where your'e suppose to and when your'e suppose to and the amp does not power up, then it may be time for a new amp. Try wiggling the connections at the amp a bit, the solder may be cold/loose.

Jul 12, 2011 | Kicker Car Amplifiers

1 Answer

Hi I amconnecting r300-4 rockford ampp at home as a test before installing in my car. I have connected 12v dc adapter but the amp's red led glows and amp turn off. Any solution

A DC adapter probably offers insufficient current to power the amplifier. What is the current rating on the adapter? What you need to test an amp on the bench is a 12 volt power supply. If you don't have a power supply, perhaps you could borrow the battery from a car. OK?

Dec 12, 2010 | Rockford Fosgate P3001 Car Audio Amplifier

2 Answers

Can you hook your amp straight to your alternator with no problems

Hi TW,
Please ignore the post here by 79 as anything but fiction.

An alternator produces DC current not AC. It does however fluctuate quite a bit. It's the low voltages that will stop your amp from functioning.

Whether you connect your amp to your alternator or your battery doesn't matter. They are connected to each other already. The battery stabilizes the current to your amp. When the amp requires more than the alt can supply, the battery fills in.

Personally, the battery is easier to connect to.

Best regards

Feb 21, 2010 | Alpine MRD-M605 - V12 MONO AMP 600WX1 RMS...

1 Answer

Alpine mrv-f345 cuts off when...

Yes sounds like your not getting enuff power from the battery could be your alternator you should have it tested. Also have you try'd a capacitor? I put one in my car and it stopped cutting out...

Feb 05, 2010 | Alpine MRV-F345 Car Audio Amplifier

1 Answer

Who needs a «remote DC terminal» ???

Hello labdes,

The "remote" terminal of the amp requires a +12V signal to rurn the amp on. Normally, this is supplied by a specific wire from the vehicle "head unit". But you can simply jumper it to the positive 12V source. + should go to the 12V positive and to "remote", - to the 12V negative. I'd wire a switch across the "remote" and "power" terminals to have a way to turn the amp on and off.

I'm hoping that your "car amp" has speaker level inputs, because the PC card is probably not going to have preamp outputs. If the amp has only RCA type inputs, you will need to purchase a LOC (line output converter) such as the PAC SNI-35 shown here. They are also usually available at your local car audio shop and some big box stores.

Hope this helps.

Jun 13, 2009 | Lanzar MXA 412 Car Audio Amplifier

1 Answer

No power to my pioneer gm5300t


good day bro, from your Pioneer amp supply line do you also see a terminal marked as " System controller" ? did you also supply 12V DC to this terminal?

the standard power configuration for Pioneer Car amps would be:

12V Dc (+) supply / ( - ) supply ground / System Controller ( supplied by +12V DC)

12V ( + ) supply and The ( - ) supply ground is for stand by power, once you connect the supply through this terminal you will now have the stand by power but will not power on the unit even the LED power indicator.

System controller terminal, this should be supplied by ( + ) 12V line to power up the amp. this serves as the ON/OFF switch for the amp.


Jan 25, 2009 | Pioneer GM-5300T Car Audio Amplifier

1 Answer

REM input on Car power amps

you should connect it to the 12v positive of the power supply, maybe install a switch in line between the amp and power supply.

May 14, 2008 | Car Amplifiers

1 Answer

Odd behavior of power and protect

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connectes to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

Do this with no RCA or speaker wires connected. Let me know what you find.

Apr 26, 2008 | Power Acoustik TS1440-2 Car Audio...

1 Answer



This is an indication of a voltage error, I have seen this when the voltage regulator or the car battery is begining to have a problem supplying enough current to the amplifier. Check the voltage levels with the amp turned off and then turn on the amplifier, if the voltage drops this means that there is poor voltage regulation and this may mean that you will have to replace the car's voltage regulator.

I hope this helps,

Thank you,


Apr 20, 2008 | Car Amplifiers

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