Question about Legacy LA1490 - American Series 2 - 1400 Watt High Performance 2 Channel Amplifier Car Audio Amplifier

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AMP Issue When I plug the RCA wire from stereo to AMP, the light on the AMP goes from green to red and there no sound coming the speakers.

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Re: AMP Issue

The problem would either be a faulty FET or a short circuit in the unit. if you know what your doing open the amp up and inspect it for any blackening on the circuit board or if any transisters, capacitors, diodes, etc looked charred. If so there are many places you can have this fixed at.

Posted on Feb 03, 2009

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Re: AMP Issue

Check for pinched wire causing ground loop. Screws and seats are easy culprits. If you have a spare RCA... or can borrow or buy a cheap one... run it from the radio to the amp without routing the wires in the car and test.
Possibly could be hitting metal behind radio. Be sure to secure and tape wires.

Posted on Dec 22, 2008

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VR3 200 AMP

Looking at this picture you can see the terminals at the top.
This installation has one speaker hooked up on the right, and the power inputs hooked up on the left.
The inputs will be power on the left, 12 volts positive (V+); a signal wire for to power on the amp that's 12 volts positive too, (V+, It's usually a yellow wire that comes out of the car stereo called To Antenna, or To Amp. and the third connector on the left is a Ground, or 12 volts Negative (12-). Look for the labels V+ and V- to get the power connectors in the right places. (I can't tell from the picture which is which)
On the left side is the Speakers, Each speaker has a positive and negative lead, and the terminals on the amp are labeled Left + and Left - and Right + and Right - .
Align the speaker leads to the terminals (in cars a negative lead usually has a stripe running along the length of it, and a positive has no stripe).

On the other side of the amp are RCA sockets, one red one white. Any low signal can plug into these, from an Ipod to a turntable. Your car stereo, or EQ, will have RCA outputs that can connect to these with an RCA Patch cord, which has plugs on both ends that will fit into the RCA sockets. Whatever signal goes into the RCA inputs is amplified out of the speakers when it works.


Nov 01, 2012 | Car Amplifiers

1 Answer

Xplod XM-554ZR Car Audio Amplifier: powr/protect light comes on red not green...

Hi, disconnect all speakers from unit and try again - if red light still shows then your amp has died.
If the light goes green, then start testing for shorted speaker/wiring. This includes speaker wiring to vehicle shorts - there should be an o/c reading on your meter

May 05, 2010 | Sony Xplod XM-554ZR Car Audio Amplifier

3 Answers

The saftey red light keeps coming on

It means that the subwoofer is blown. The red light is called the Protect light. Disconnect the speaker wire from the amp and then turn the amp on and see if the red light goes away. But if as soon as you hook the speaker wires back to the amp and the red light turns on that DEFINATELY means the sub is blown.

Apr 04, 2010 | Cadence TXA 1000D High Power Mono...

1 Answer

The portection light on my alpine mrv-1507 wont let me get any sound

remove the rca wires and the speaker output wires and just leave the 12volt power/ remote/ and ground connected. turn on the radio and see if the light goes off. if it does then one of your speaker or rca wires are shorted, plug in one at a time and see which one gets you the red protect light, then find the short for that speaker/rca wire. if the red light turns on with only the 12volts/remote/ground, then the short is in the amp.

Feb 26, 2010 | Ohm Crystal Mobile Sound CADT 600.2...

1 Answer

Wiring diagram ford f350 04 for radio need color codes

2004 Ford F350 Truck Car Radio Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Light Green/Pink
Car Radio Accessory Switched 12v+ Wire: Black/Violet
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Light Blue/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: Blue
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Light Blue/White
Left Front Speaker Negative Wire (-): Orange/Light Green
Right Front Speaker Positive Wire (+): Dark Green
Right Front Speaker Negative Wire (-): White/Light Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Tan/Yellow
Left Rear Speaker Negative Wire (-): Gray/Light Blue
Right Rear Speaker Positive Wire (+): Brown/Pink
Right Rear Speaker Negative Wire (-): Orange/Red

Jan 04, 2010 | Car Amplifiers

3 Answers

Red Power Protector light

Hi, the only way i can see the amp resets the stereo is that power is dropping. The amp should have its own wires directly to power/battery so as to not affect anything else.

On the protect, try to disconnet all the speakers, make sure the power is OK. If it appears to work, the there could be a problem with speakers/cables. Try a different speaker to see if it works. If the problem continues with speakers off, a different speaker etc, then there is a problem with the amp. Hope that helps

Jul 21, 2009 | Sony XM-2100GTX Car Audio Amplifier

1 Answer

Similar prob.did the 12 steps on how to install amp(jensen4100,blue).red protec light comes on when starting car then goes out and is not followed up by the green protec light .green one never comes on....

If you are running a set or a single subwoofer with the jensen amp than you will want to hook up the rca cord to the subwoofer rca connection on the back of the stereo unit-the other rca outputs are there in the event that you want to run a 2 or 4 channel amp to power the speakers that are generally located in the doors or back deck-with that set up properly you would still be able to adjust the balance and the fader just as though you were powering the speakers with the deck. Pug the free ends of the RCA cord into the input rca receptacles of the amp- the stereo now will feed a signal to the amplifier that only contains bass - good luck

May 16, 2009 | Jensen LXA300 Car Audio Amplifier

1 Answer

Thumping speakers - no power light is on - wired correctly

the amp is going into protect mode due to something wrong in the amp or some thing in the wiring to it ooh yea if you are getting 18v power to the amp that is way to high it should not be higher then 15v if the amp is in protect mode it will not play at all.

Nov 02, 2008 | Visonik Dual Bass Box with Amplifier Car...

1 Answer

Amp Power light will not go on. Protection light is lit- Thump sound in speakers

It probably has shorted output transistors. To eliminate other possible causes, read through the following page.

Amplifier in Protect Mode - Troubleshooting

Let me know if you have any other questions.

Oct 31, 2008 | Visonik Dual Bass Box with Amplifier Car...

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