How can I tell if a fusible link has melted?

The manual states a melted fusible link can be detected either by visual inspection or by feeling with a fingertip. If its condition is questionable, use a circuit tester or test lamp.

What should I do before installing a new fuse if one is blown?

Be sure to eliminate the cause of the problem before installing the new fuse, and always use a fuse of the specified rating—never one rated higher.

Can I wrap a fusible link with vinyl tape?

No. The caution says never wrap the periphery of the fusible link with vinyl tape, and to ensure it does not come into contact with any other wiring harness or vinyl or rubber parts.

What might it mean if a fusible link melts?

It is possible that a critical circuit (power supply or a large current carrying circuit) is shorted. In such a case, carefully check and eliminate the cause of the problem.

What should I do with the clock fuse if the vehicle sits unused?

Remove the fuse for the clock if the vehicle is not used for a long period of time.

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Nissan Micra Power Supply Routing - Fuse & Fusible Link Check (EL-6)

Power supply routing: fuse check and fusible link inspection cautions

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Electrical shop-manual page EL-6 on fuse and fusible-link inspection: use only specified fuse rating, detect melted fusible links by sight/touch, and find the short before replacing.

AI caption February 2006 · Photo 352 of 412

This is page EL-6, titled "POWER SUPPLY ROUTING," from a Nissan service manual, uploaded to accompany a 1990 Nissan Micra. The page covers two topics: fuses and fusible links. The Fuse section includes an illustration of a blade-type fuse showing where to check its element (figure SEL276) and lists four precautions: eliminate the cause of a blown fuse before replacing it, use only the specified amperage rating, insert fuses straight (never obliquely) into the holder, and remove the clock fuse if the vehicle will not be used for a long period. The Fusible Link section explains that a melted fusible link can be detected by visual inspection or by feeling it with a fingertip, and that a circuit tester or test lamp should be used if its condition is questionable; an illustration (SEL027D) shows the fusible link location in the engine compartment wiring. Cautions state that a melted fusible link may indicate a shorted critical circuit (power supply or large current carrying circuit) requiring careful diagnosis, and that the link must never be wrapped in vinyl tape and must not contact other wiring harnesses or vinyl/rubber parts. No fuse box layout, amperage chart, or specific model/year applicability is shown on this page.

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Frequently asked questions

How can I tell if a fusible link has melted?: The manual states a melted fusible link can be detected either by visual inspection or by feeling with a fingertip. If its condition is questionable, use a circuit tester or test lamp.
What should I do before installing a new fuse if one is blown?: Be sure to eliminate the cause of the problem before installing the new fuse, and always use a fuse of the specified rating—never one rated higher.
Can I wrap a fusible link with vinyl tape?: No. The caution says never wrap the periphery of the fusible link with vinyl tape, and to ensure it does not come into contact with any other wiring harness or vinyl or rubber parts.
What might it mean if a fusible link melts?: It is possible that a critical circuit (power supply or a large current carrying circuit) is shorted. In such a case, carefully check and eliminate the cause of the problem.
What should I do with the clock fuse if the vehicle sits unused?: Remove the fuse for the clock if the vehicle is not used for a long period of time.