Test a loose blade fuse with a Fluke 101

Check an already loose automotive blade fuse with the Fluke 101, verify the meter before and after, and record a clear result.

Beginner, isolated bench parts only · 10–15 minutes

Step by step

Photorealistic illustration · Waey

1. Choose an already loose low-voltage fuse

Use a clearly identified low-voltage automotive blade fuse already removed from all equipment, plus a known intact control fuse. Keep the bench dry and clear of batteries, chargers and powered circuits. Read the fuse markings and packaging; do not identify its rating by colour alone. This is a bench continuity check, not instructions to remove a fuse from a vehicle, household plug or fuseboard. Set aside cracked, scorched or corroded parts rather than returning them to service.

Photorealistic illustration · Waey

2. Inspect and set up the Fluke 101

Inspect the meter case, sockets, lead insulation and probe guards. Stop for damage, a low-battery warning or unreliable operation. With the selector off, seat the black lead in COM first, then the red lead in the voltage/resistance input. Select the resistance position and press the yellow button once to enter continuity mode, following the actual Fluke 101 markings. Keep HOLD off and your fingers behind the guards; other meters may select continuity differently.

Photorealistic illustration · Waey

3. Check open and touching probes first

Keep the probe tips apart: the meter should indicate an open path without a continuous tone. Then touch the clean tips together. Confirm a steady tone and low resistance, noting this lead-contact reading as your comparison. Separate them again and check that the open indication returns. Test the known intact loose control fuse across its two blades as well. If these checks fail or fluctuate, stop and resolve the meter, lead or contact problem before judging the suspect fuse.

Photorealistic illustration · Waey

4. Touch one probe to each separate blade

Place the suspect fuse on the dry nonconductive bench where it cannot roll or slide. Hold the insulated probes and place one tip firmly on each of its two metal blades. Keep the tips separate so they cannot touch each other and bypass the fuse. Avoid touching both blades with your fingers. Read the display and note the tone while maintaining steady contact; a momentary slip is not a reliable open-fuse result.

Photorealistic illustration · Waey

5. Interpret the reading without overclaiming

A steady low reading close to your lead-contact and intact-control readings supports continuity through the fuse. A stable open indication with sound contacts indicates an open element. The Fluke 101 beeps below 70 ohms, so a tone alone does not certify a healthy low-resistance fuse: treat high, unstable or ambiguous readings as unresolved. Continuity cannot verify the fuse’s current rating, time characteristic or performance under load, or explain why it opened.

Photorealistic illustration · Waey

6. Recheck, label and put the meter away

Repeat the probe-touch and known-control checks after testing the suspect fuse. If the controls now fail, discard your conclusion and troubleshoot before retesting. Record the fuse markings and result as continuous, open or unresolved, keeping questionable parts separate. Turn the meter off, remove the red lead before the black and store them without sharp bends. Never bridge a fuse or choose a higher rating; any later replacement must match the equipment specification and its fault must be addressed.

Three original generated contexts individually and as final JPEG sequence reviewed across six steps: corrected two-input blank/off preparation, probe-tip contact control and overhead separate metal blade contacts. Same white blonde woman/pale-blue shirt/dry grey mat/red loose blade fuses and guarded probes. Three rejected candidates retained privately: invented third input and two ambiguous blade-root/housing contacts. Exact101 dial positions/symbols, active mode, display/tone, contact resistance, fuse ratings, dimensions and performance are not image proof; actual manual and physical controls govern. No power sources, installed circuits, hand bridge, extra current jack or fuse bypass in selected scenes. No manufacturer/video-image generation inputs.