Fusible Link (Main Fuse)

It protects circuits that carry very high currents. It is often found in a box on the battery terminal. A blown link can cut power to large parts of the car. Main fuse boxes on the battery terminal are often replaced as a complete unit. Correct tightening of the battery terminal and nuts is important to avoid heat at the connection.

The link melts when current exceeds its rating, opening the circuit.

Find the cause of the overload before replacing it. Never replace it with a higher rating or plain wire.