In troubleshooting a non-operating DC circuit, after verifying power status and fuses, what is the next recommended step?

In troubleshooting a non-operating DC circuit, after verifying power status and fuses, what is the next recommended step?

• A. Jump the circuit
• B. Replace the battery
• C. Test switches/relays
• D. Inspect wiring and connectors

Answer: (D)

After confirming the circuit has power and fuses are intact, the next step is to inspect wiring and connectors. When power and protection are good, faults are often in the path between the source and the load—loose or disconnected connectors, corrosion at grounds, damaged insulation, or pin misalignment can all prevent operation without triggering a fuse. A careful visual check plus continuity testing helps verify that the circuit is actually continuous from source to load and that connections are clean, dry, and properly seated. If wiring and connections look good, you can then move on to testing switches and relays. Jumping the circuit is unsafe and bypasses protection, and replacing the battery is unnecessary if power has already been verified.

After confirming the circuit has power and fuses are intact, the next step is to inspect wiring and connectors. When power and protection are good, faults are often in the path between the source and the load—loose or disconnected connectors, corrosion at grounds, damaged insulation, or pin misalignment can all prevent operation without triggering a fuse. A careful visual check plus continuity testing helps verify that the circuit is actually continuous from source to load and that connections are clean, dry, and properly seated. If wiring and connections look good, you can then move on to testing switches and relays. Jumping the circuit is unsafe and bypasses protection, and replacing the battery is unnecessary if power has already been verified.