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THIS IS "DC OFFSET". MOST AMPLIFIER PROTECTION CIRCUITS REACT TO THIS CONDITION BY SHUTTING THE AMPLIFIER DOWN. THIS IS A CONDITION, NORMALLY BROUGHT ON BY SHORTED OUTPUT TRANSISTORS, THAT ARE TRYING TO PASS THE POWER SUPPLY DC CURRENT TO THE SPEAKERS, WHICH IN A MATTER OF SECONDS, WOULD BURN THE VOICE-COILS IN THE SPEAKERS. MOST TIMES THIS WOULD BE CHARACTERIZED AS HOOKING THE SPEAKERS UP AND OBSERVING THEM SIMPLY POKING OUT OR IN CONSTANTLY WHICH CREATES MUCH EXCESS HEAT. THIS IS WHY THE AMPLIFIER WILL SHUT DOWN TO PROTECT THE SPEAKERS. YOU CAN TRY TO DISCONNECT THE SPEAKERS AND THE RCA INPUTS THEN POWER THE AMPLIFIER UP. IF THE DC OFFSET LIGHT STILL ILLUMINATES, THEN YOU WILL HAVE TO HAVE THIS UNIT REPAIRED. ONCE REPAIRED, BEFORE REINSTALLING IT, MAKE SURE TO CHECK YOUR SPEAKERS FOR DAMAGED VOICE-COILS, WHICH COULD HAVE BEEN THE PRIMARY CAUSE OF FAILURE. OK. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE....V
Does the amp power up? Did you knock the fuse loose with a deer hoof? Sorry couldn't resist that. Check all of your wiring with an ohm meter especially your speaker cables. Check for DV voltage at the power input to the amp and also the remote turn on. If you get voltage there try turning the amp on and measuring the AC output voltage of your amp from plus to minus. (crank the volume up) That will also tell you if your amp is functioning. Verify signal to the amp. If you have a portable stereo with aux inputs drag it out to your car and plug your RCA into it. If you get sound to your portable stereo you have signal. You can't reliably measure the AC voltage with a meter because it is so low, if you had a scope that would work. Test your subs on your home stereo, (verify impedance first). These are just some ways to divide and conquer good luck man!
could be power, could be ground, do you have a factory amplifier aswell as an aftermarket one in your vehicle.. If so if you have the 3 remote wires spliced together to kick on your factory amp you can have problems with this. Basically having more than 1 amp wired in series together can do this... there are many factors to this but first check your ground on the headunit and make sure it's makin a good chasis ground..
If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following.
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 connected 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.
If the voltage remains near or above 12v, disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp almost certainly has shorted output transistors and will need to be repaired.