Buzzing coming from Mach 460 sound system

[coke]

Anyone have any idea where to start looking for the source of a buzzing problem is my stereo(Mach 460 system in a 1994 GT)? Its fine with the engine off, but after the engine is running it buzzes like crazy. If you swich on another electrical accessory it quietens down a bit. Its probably a bad ground somewhere, but are these systems known for a bad ground in one certain area over another?-Thanks

 

[zcs626]

sounds like a bad ground. but it could just be the stock amps going bad since its over 10 years old.

easiest thing to do would be to find a friend or someone willing to loan you the same type deck and stick it in, and see if it buzzes.

 

[coke]

Thanks,I'll try that.