There are a few ways to determine which one is the culprit, depending on how your amp is installed and where the wires are routed.
Enwere ụzọ ole na ole iji chọpụta onye bụ onye na-eme ihe ọjọọ, na-adabere n'otú esi etinye amp gị na ebe a na-akụ wires.