Voltage regulator fuse melted

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What would cause a voltage regulator fuse to melt. On 2001 Grasshopper. No effect has been noticed except after market lights don't work. The fuse did not just blow it actually partially melted.

 

[ILENGINE]

Melting means heat. Heat is caused by resistance. A loose or corroded fuse holder, or fuse contact surface is usually the cause.

 

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It seems the fuse holder was the culprit. I replaced the fuse holder with external fuse holder and now all seems fine. The lights problem was unrelated, switch bad. Thanks for the reply, it saved me a lot of work and time.