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On a negative ground car, like ours, you ground one side of the load, which is your horn.
A way to think about it is.
A ground is the solid side of the circuit. It is best to have solid ground under your legs.
It takes a positive decision to switch off or on something.
Switches are most of the time, installed on the positive side from the battery. I have seen it done the otherway, which does not mean it is the best method.
The reason is. If a switch is on the groundside and IF it is possible that the wire before switch or even the horn/load itself can become grounded, like internally, the horn will blow all the time or the load will drain the battery.
The fuse is between the power and the switch or load to protect the wires. It is best to installed it as close to the power source so that the supply wire is exposed less to a possible short back to the power source.
The fuse cannot be bigger in amperage size than the smallest wire gage used for its amperage capacity.
The size of the fuse can be smaller than the wire capacity of the circuit in order to protect the wires better or any sensitive/expensive lower powered equipment such as a radio.
Hope the rules help you.
Phil
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