Question about Jensen KA3 Car Audio Amplifier

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Amp not working

Well i went to hook up my jensen ka-3 2 channel amp and i connected up the ground then right as i touched the 12v to the amp it sparked like there was a short but i hooked up a different amp and it worked fine id like to know whats wrong. Thanks

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What's the problem? It's not unusual to get a spark when you connect power to an amplifier; there are capacitors in the amp that will charge. Is the amplifier not working?

Posted on Feb 26, 2007

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Posted on Jan 02, 2017

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Jensen ka4400 400w amp


Hello Brian,
I have done a search for the Jensen KA-4400 Amplifier manual, without any luck. Sorry.
However the following might be useful for you to continue the search:
(1) Jensen Customer Support: 800-732-6866
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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...


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1 Answer

I have an older model Jensen 500 watt 2 channel bridgeable amp. When i hook it up the red light(protect light) comes on and it will not work


REMOVE THE RCA INPUTS AND DISCONNECT THE SPEAKERS AND POWER THE AMPLIFIER UP WITH THIS NO INPUT, NO SPEAKER LOAD CONDITION. IF IT STILL GOES INTO PROTECTION 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. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

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1 Answer

Does the rmt hook up to ground or power


Hi the RMT is short for remote and is connected to a 12v feed taken from the remote output from the cd player, it provides the 12v needed to turn the amplifier on when required & turns it off when the player is turned off. Do not connect this to a permanent 12v feed as the amp. will be on all the time & you will have a flat battery every morning! Cheers, acbva.

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1 Answer

Crazy Car Amplifier


to be honest with you, your best bet is to buy a new amp.  cheap amps are cheap because they plan on you buying another one when they don't last.  save up and buy a nice amp, thats my advice.  if you really want to fix this one i wish you luck, but i've never worked on an amp before, just install and troubleshooting, so in my experience this one's fried.  But i'm sure it could be fixed, the question is wether or not it is worth it?

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No power to the amp i touched the power wire to the side of the amp


It probably burned a trace on the circuit board.

With the amp hooked up normally and the head unit on (so the amp will have remote voltage), do you read 12v DC anywhere on the case of the amp (black meter probe on the ground terminal of the amp)?

If there is no voltage on the case, confirm that you have 12v on the B+ and remote terminals of the amp (black probe on ground terminal of the amp).

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1 Answer

Protection light comming on.


I'd be inclined to check to make sure there isn't a short circuit somewhere in the output lines. Maybe a wire is crushed against the car's body or bare wires touching or badly fitted RCA plugs. All of these things could activate the protection circuit. If you have a multimeter it would make life easier but don't forget your speakers will show up as 4 ohms so that's not a short. BMW

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