Electrical question

Lester Weinraub

I just bought the hella horn set from moss that comes with a relay. Unfortunately the instructions are poor. The relay has four terminals. One goes to the horn switch wire, on goes to the actual horns positive side, one goes to the power/battery. What does the fourth terminal connect to? In addition the connection to the batter/power requires an in line fuse. Any idea what size fuse?

Thank you,


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