Engine cooling fan running constantly when ignition is ON or engine running (even when cold)

I made the mistake of accidentally piercing through a wire bunch, which put in contact a black wire directly connected to the battery's positive post and a red wire going to the black box with big fuses in the left part of the engine compartment. I don't know what this red wires powers. Engine runs OK but fan keeps running all the time. I checked the wires, separated and isolated them with tape so they wouldn't touch anymore. I did that BEFORE starting the engine after the piercing incident. It did not have this problem before.