What is the standard method to verify a circuit's continuity before replacing a fuse?

• A. Use a test light with the circuit powered on.
• B. Use a multimeter to check continuity through the circuit path with power off and loads removed, ensuring there is a clear path when the fuse is installed.
• C. Inspect for visible damage only.
• D. Replace the fuse and test operation.

Answer: (B)

The idea is to confirm that the wiring path of the circuit is intact and that the fuse is the only limiting device in the path, using a safe, reliable method. With the system powered off and all loads disconnected, use a multimeter set to continuity (or a low resistance setting). Place one probe on the supply side of the circuit (the fuse input) and the other on the downstream side (the fuse output or the load path). A clear continuity result (a beep or near-zero ohms) means there is an uninterrupted path through the wiring up to where the fuse sits, so the circuit can function once a good fuse is installed. If continuity is not present, there’s a break or damaged conductor that needs repair before replacing the fuse. This approach avoids guessing with live power, and it verifies that a previously blown fuse wasn’t caused by an open circuit in the wiring. After confirming continuity, replace the fuse and then re-energize to confirm proper operation.