Were is the fusible link located on my2004 chevy $10 ?

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Everything comes on truck won't start trying to locate fusible link to see if it's blown please help.the problem started with headlights the relay fuse I think was bad so I switched the starter relay to check and when I attempted to turn key off sure enough the truck started acting funny like it didn't want to turn off so i rushed to remove the bad starter relay fuse and now that I put the good back in the truck won't turn over at all so I'm thinking it's a fusible link that's blown need help for location to check