Locate the amp rating for the accessory you are going to install. This is the amperage the accessory is rated for and it is only safe to use the accessory at or below this rating. Amperage ratings are listed in the accessories manual near the beginning of the installation section.
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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