A fuse is a protective device installed in an electrical circuit to prevent damage to the other components in the circuit from excessive voltage or current.

Fuses achieve this protection by interrupting current flow when the excessive energy melts or burns away the conductive material held between the fuse’s two terminals. Once a fuse has opened (blown) it must be replaced in order for the circuit to receive power again.

Fuse have changed over time to serve the increasing demands of proliferating electrical devices and higher draw accessories as installed in current generation vehicles.

Cause and Diagnosis
An occasionally blown fuse is not abnormal and can be caused by exception operating conditions. Frequent interruptions can be an indicator of serious problems like bad wiring or failing components.

Custom Use
Selecting and Using Fuses in Custom Applications

Vehicle Specific Fuse Box & PDC
Fuse box location and diagrams by vehicle