Windowsrookie Posted February 12, 2009 Share Posted February 12, 2009 I upgraded the positive wire from my alternator to 4 Gauge, the old wire had a fusible link on it. What is the purpose of the fusible link, and is it still needed with the 4 gauge wire I upgraded to? I also plan on installing a higher output alternator in the future, does that affect anything? Link to comment Share on other sites More sharing options...
Eagle Posted February 12, 2009 Share Posted February 12, 2009 The fusible link is a fuse. The purpose is to protect the system, and to reduce the possibility of underhood fires. If you replaced the fusible link with a heavier gauge wire, you need a fuse. You can get heavy-duty, 100-amp in-line fuses at marine supply places, and my brother told me that Auto Zone may now carry them. Link to comment Share on other sites More sharing options...
Tomahawked Posted February 12, 2009 Share Posted February 12, 2009 A fusible link is designed to break if the maximum rated load of a given wire size is exceeded. So if the 4 ga wire is rated for more than what alternater produces, just fuse for it instead. Link to comment Share on other sites More sharing options...
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