Posted by John T on January 03, 2020 at 05:00:25 from (107.77.215.178):
In Reply to: Melted fuse posted by ztw2009 on January 02, 2020 at 20:19:58:
When you get resistance in any connections, including blade fuses or the fuse holders, the I Squared R heat energy becomes significant and can melt plastic as shown in your pictures. Older components including fuse holders and even the fuse contacts themselves can develop oxidation and carbon IE resistance. Having owned RV's for 49 years I've seen fan or furnace blower motors begin to draw excess current (maybe bushings maybe electrical) even if not enough to blow fuse and if so they need replaced.
Its a job to replace that entire fuse assembly but from the looks of it that may be required. If not get into that bad circuit (ahead of and BEFORE the assembly) and patch a new fuse and holder to it. It would take an ammeter to measure current draw of the fan motor, but there's a chance it may be excessive. If not then resistance (oxidation or carbon) must have been the cause.
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