Horn wiring issues

gearshift46

I have a 1992 260 Fiesta V where the two horn wires exit the deck just forward of the windshield and behind the starboard hatch. 1 pair of the wires broke off flush with the deck and shorted out taking the fuse with it. I want to replace these wires and install a single horn. It looks like the wires run under the headliner. Do I need to remove the headliner to access these wires? do they wind up going over the ceiling of the head?

Cableguy Greg

Is your head on the same side of the boat? There could be an access in there if it is. 

gearshift46

Head is all one moulded piece....I see no access. Thanks though.