If a fuse blows again after it has been replaced what is the cause?

Answer 1

Fuses and Circuit Breakers are placed in an electrical circuit to protect the conductors [wires] from overheating damage, and the possible fires which can result. Fuses and Breakers are designed to detect excess current flow [measured in Amps], and when detected, "blow," cutting off the flow of electrical current. When these devices continue to blow when replaced, or reset, indicates an overload condition, usually caused by a short circuit [a hot wire in contact with something which is grounded, like a ground wire or a grounded metal part], or an overload [caused by something like an add-on device, a monster amplifier for example]. The way to fix this problem is to first find what is causing the overload, and then remove it from the circuit.