Alternator?

Alright so finally got time to work on it. kept the last alternator in there and tried a new regulator, still the same problem I turn the lights on and it reads towards the D on the alt gauge. I dunno if this means anything but a day before this problem started my horn and courtesy light fuse blew so i changed it and the horn just makes a clicking sound now, is there a horn relay and could this affect my bigger problem at all?