It’s not uncommon to see people wire radios to the fuse box by inserting the power wire directly into a fuse slot and then inserting a fuse on top of it. Although this may work, it is also dangerous and could damage your new radio or create a potential fire hazard. You should also avoid using a fuse with a higher amperage rating than that specified for your new radio or stereo. While the radio will still work, you defeat the purpose of the fuse by using one with a higher amp rating. A fuse amp rating indicates how much current, in amperes, the circuit can withstand before the fuse blows. If you use a fuse with too high a rating, it may not blow or fail in time to prevent damage to your radio. For instance, using a fuse rated at 25 amps with a 15-amp car radio may allow too much current to pass through the circuit and cause irreparable damage to the stereo.
Notice that battery voltage travels through a high current wire (red) through the relay to the horn and also through a smaller wire (blue) through the ignition switch to the relay's low-current coil. The first thing you should be aware of is that the horn circuit is always "hot" or "live" when the ignition switch is turned on and all that's needed is a path to ground.
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