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I just bought a dual amp and 2 dual 12" subs in a bandpass box from Best Buy(I don't really care how crappy anyone says they are, I just want a little more bass to my system and do not want to spend a lot of money) Anyways, I get everything hooked up and the protection light comes on whenever I power up my car. Everything is wired correctly, according to the diagrams and what not, I have installed a system once. The light will turn off if BOTH rca's are unplugged and that's it. It will stay on if the speakers are unplugged and I've tried unhooking everything except power and plugging the remote directly to the pos battery and the lights stays off until I plug in the rca's. I am at a loss. I am trying to avoid going to the store, so all help is appreciated. By the way, I tried a different pair of RCA cables and the red light still came on. I've already replaced the fuse IN the amp itself and the entire fuse holder on the power line and I put a new fuse in it. It can't be the speaker line if the light stays on after they are unplugged right?

How is your ground wire? If the ground isn't a true ground, or if the painted is scraped away, it could be causing this.

lotas had a probably with this, his amp would AUTOMATICALLY go to protection mode, he fixed by accident i forgot how he did it, look up the thread he made about finaly getting sound or something like that.