Question about Cars & Trucks
A fusible link is a short piece of insulated low-voltage cable within an automotive wiring harness that is designed to protect the harness in applications where a fuse is unsuitable. In an extreme current overload situation, the conductor within the link is melted while the ensuing flame and spark is contained within the link's insulation.
Fusible links are not rated in amps like fuses because each installation is unique and designed to meet specific circuit protection requirements.
The automotive service industry recommends using the same gauge and length as the blown fusible link after the cause of failure is corrected.
Typically, a given harness segment is protected by a fusible link that is four gauge numbers smaller. A 14-gauge wire would be protected by an 18-gauge fusible link. A 6-gauge wire would be protected by a 10-gauge link, and so on. Odd number wire gauge sizes like 19, 15, 13 and 11 are counted when sizing a link. The length of a fusible link should not exceed 9".
In general, a fusible link should never be used to replace an automotive fuse unless authorized by a vehicle factory service bulletin. Likewise, never replace a fusible link with an automotive fuse.
Fusible links are used in most starting circuit applications. For more technical info on fusible links, visit www.sae.org
Posted on Dec 01, 2013
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