Horn Relay ?

[baz-r]

it would depend on the rating of the switch and cable used in the circuit

you could get rid of some of them

horns dont always have a relay to control them and as the duty cycle is very low (not on for long) you could probly get away without one
most colums earth the horn wire when pushed so a horn has a constent live (even with ign off)
its also an idea to have your brake lights on a perm live to

flashers/hazerd will need one

fuel pumps if thay are inj type (its good to have some form of cut out)

fog lamps dont need one but have to work with the lights on it would depend on the switch rating but a 21w bulb will be drawing 1.5A and thats naff all

if you think of it logicly you could easy get it down to 3-4 relays no trouble