Question about Legacy Audio LA770 Car Audio Amplifier

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I have the subs hooked up to the amp and the speaker wires from the cd player connected, when i hook up the ground and power nothing happens.. sometimes the protect light comes on..? help..

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  • sneeky May 11, 2010

    Are you hooking up the remote turn on wire? I didn't see this in your post.

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  • 92 Answers

LETS SEE IF YOU HAVE A PROBLEM WITH THE AMPLIFIER ITSELF OR IF SOMETHING IN THE INSTALL REMOVE THE RCA INPUTS AND DISCONNECT THE SPEAKERS, THEN POWER THE AMPLIFIER UP WITH THIS NO INPUT, NO SPEAKER LOAD CONDITION. IF IT STILL GOES INTO PROTECTION OR FAILS TO POWER UP AND YOU HAVE VERIFIED THAT THE POSITIVE AND ESPECIALLY THE GROUND CONNECTIONS, ALONG WITH THE REMOTE CONNECTIONS ARE 100%, THEN THE AMPLIFIER WILL NEED TO BE SERVICED. SOMETIMES THE RADIO CAN HAVE A DEFECTIVE SAGGING BELOW 11 VOLTS REMOTE OUTPUT WHICH WILL CAUSE THE AMPLIFIER TO NOT POWER UP. IF YOU DISCONNECT THE RADIOS REMOTE LEAD AT THE AMPLIFIER AND TEMPORARILY INSTALL A JUMPER FROM THE POSITIVE POWER TERMINAL AND THE REMOTE TERMINAL OF THE AMPLIFIER, THIS WILL NORMALLY FORCE THE AMPLIFIER ON. AT THIS POINT,YOU HAVE TOTALLY BENCHED THE AMPLIFIER AS IT WILL NOT HAVE ANYTHING TO DO WITH THE ACTUAL INSTALLATION AND IF STILL FAULTY IT SIMPLY WILL HAVE TO BE SERVICED. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

Posted on Jan 06, 2010

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You either have a bad ground from your amp to the vehicle or a problem with the amp. Where is the amp grounded? Do not ground an amp to a seat bolt or side panel on any vehicle. The weld points on the car itself cause issue with ground. Take the ground wire directly thru the bottom panel (floor) Check befor you drill! don't hit a wire/fuel line, etc. That will give you a solid ground. Keep your ground wire length to a minimum. 18" or less, and use the same gauge wire for ground as you do for power. Hope this helps

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My generic suggestions:
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Jerry G.


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