no power to vehicle battery is good
no power to vehicle battery is good no horn no interior lights fuseable link
replaced. All fuses have been checked and are good.
Check the battery cables and make sure the connections are clean and tight. Charge the battery as well if you can.
If your cables have add on ends then those are prime suspects as they collect corrosion like Imelda collected shoes.
A catastrophic failure like this is going to be battery related as Full of Regrets said. Check the wiring down at the starter as well as the battery ground (-) cable connections at both ends. HTH. -Jim
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