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If the car was running when testing sub and heard noise this could be engine noise and an inline filter would cure that problem and also have a good ground no more than 15 inches away from the amp.And good metal contact for ground.
You might be able to have it fixed. Some amp companies make their own parts, so you would have to sent it to them. If you can find someone to diagnose the problem first, you could save yourself some money. I have repaired amps with parts from Radio Shack myself.
There may be a loose wire to the lights, or the power supply or amp may have a problem. Do you have the amp mounted to your sub box directly? You shouldn't. The vibrations from the bub will kill the amp in a short amount of time. If it is noticeably weaker, you should check out all aspects of the system. For instance, if you have a dual voice coil sub, is one coil open? Is one channel on the amp bad? Is half of the power supply on the amp bad? hence half the power, and no lights?
Many amps will go into protect mode if one of the speaker wires is shorted or grounded, or if the voice coil(s) are defective. Try disconnecting the speaker wires one at a time and see if the amp still goes into protect upon power up. Likewise, some amps will go into protect if one of the inputs is grounding out. Again, to troubleshoot, disconnect them one at a time and try the amp. Next, make sure that the amp itself is not grounding. Most amps need to be mounted to a nonconductive surface. If the case contacts the frame of the vehicle, it can cause a problem. If the problem is not in the speaker wires or the input cables, the amp case is not contacting the vehicle frame, and you have checked your power, ground and turn-on leads, then the amp itself is probably faulty.
CALL BOSE THEM SELF..OR A BOSE REPAIR SHOP THEY WILL GET THEM FOR YOU....... THEN TAKE THE AMP APART DESOLDER THE HOLDERS AND REPLACE THEM YOU CAN GET A REAL CHEAP SOLDERING IRON AND SOLDER @ RADIO SHACK CALL A REPAIR PLACE.....FIX IT YOUR SELF SAVE YOUR SELF A LOT OF MONEY AS LONG YOU DID NOT BURN UP COMPONENTS TAKE A LOOK INSIDE FIRST BEFORE YOU BUY ANYTHING GOOD LUCK
What you need to do, is also run the rca cable from the back of the deck to the amp. The speakers are already powered by the deck. You can then hook up your subwoofers. The switches are for your own taste.. you adjust them as you go.
If you have any experiance with electronics remove the casing and check the fan with a external 12V power source. If the fan still does not work, it needs to be replaced, try and get a brushless fan as it will last alot longer.