protection light on amps?

Disconnect the speaker wires from the amp terminal, you could have a blown speaker or a short somewhere in the speaker wiring. 

protection lights are almost always something with the load on the amp from the sub, wiring, blown sub, or just a lower impedence than the amp can handle.Quad L Handyman services

Nah, its nothing to do with the load, as the protection light comes on even when there is nothing hooked up to the amp. And its not my wiring, because we tested it in a mates car off hios wiring and it was the same.

When you say "we tested it in a mates car off hios wiring and it was the same", do you mean you moved your amp into his car and tested it with his sub, you moved your sub into his car and tested it with his amp, or you hooked up his sub to his amp the same way you did yours? Need to be a little more specific, and never assume. Always check and recheck. Disconnect everything from the amp and let it sit for a while (like 30 minutes or an hour), then hook everything but the sub back up. Does the protect light still come on? Check your voltage going to the amp, make sure it's at least 12v. Check your grounds (clean, bare metal, less then 3 feet from the amp, and attached directly to the vehicle's chasis).Squirrel

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yeah, we took out my amp from from my car and put in my friends car and tried it off his wiring. I also have a fusion amp which works fine in both cars. Im having it looked at now , but yeah it has a good ground and voltage seems to be okay. I hope its not a blown transistor, but i wouldnt have thought that this would cause the protection circuit to activate. Ill keep you posted on how it goes.***continuous exposure to sound pressure levels over 100db may cause permanent hearing loss. high powered

autosound systems may produce sound pressure levels well over 130db. use common sense and pr

check all connections... a bad connection will do it and your power supply may be fried but its unlikely

Is a power supply more or less to fix than a blown transistor? I assume it would about the same.