NOCTI Automotive Practice Test

To replace an open fuse properly, you should use

Use the same rated size as the original fuse Use a fuse with the recommended capacity Use a fuse with a higher rating Use a fuse with a lower rating

Correct Answer:

Use a fuse with the recommended capacity

Explanation:

Fuses protect wiring and devices by interrupting current when it becomes excessive, so the replacement should match the capacity specified by the manufacturer for that circuit. Following the recommended capacity ensures the circuit operates normally under typical loads while still being protected against faults. Using a fuse with a higher rating can let too much current flow during a fault, risking overheated wires or components. A fuse with a lower rating can blow prematurely or mask problems by tripping too easily. While some situations might align with the original fuse rating, the safe and proper approach is to install the fuse capacity given in the service information or on the fuse panel label, ensuring correct protection for the circuit.

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