Yes. That theory could be true but we need to test it. Let's start with finding out which fuse is the one that keeps blowing. You said it was when you turn the key on so I assume it was fuse 80 because fuse 73 is hot all the time.
If this is the case let's unhook the components on this circuit one at a time and replace the fuse each time until it does not blow any longer.
Basically you want to unhook the horns and the horn relay and other connectors one at a time and turn the key on until the fuse doesn't blow any more. We need to narrow down the circuit to try and find the issue.
Let me know if you have questions.
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Friday, May 8th, 2020 AT 4:14 PM