A fusible link is a short piece of wire several gauge sizes smaller than the circuit it protects. It will melt in an overload situation, opening the circuit.

The starter and other circuits have fusible links. The size is printed on the insulation. If the insulation is burned beyond recognition, consult your dealer/retailer for the proper size. Replace a fusible link with one of the same size and insulation type. Fusible link insulation is a special purpose high-temperature material.

Some examples of circuits with fusible links are the hydraulic brake booster motor feed circuit, the generator output circuit, and the intake heater feed circuit in vehicles with a diesel engine.