Ender 3 help hotend part replacement

hi, was trying to find out if someone can help me? I had a problem with my Ender 3 were I had to replace the hotend assembly with the two fans and nozzle. Well part arrived looked exactly what I ordered accept 3 things three wires with common pc board connectors and my board only has 2 and It also comes with the heater element red wires that are screwed in which I know where that one goes.. so if there is someone out there who can help me I would really appreciate it..