Horn on steering wheel not working on 99 GT BUT works with Keyless Remote Access button

HLee 99 Ford Mustang GT said:

Horn on steering wheel not working on 99 GT
BUT the horn works with Keyless Remote Access button

Has anyone encountered this issue? Thought to change out the fuse and horn relay.
I have located where the fuse is but have not identified where to replace the horn relay.

Thanks for any help you can provide!

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