Got a pretty giant wiring mess in my 22-4, and this is after cleaning up!  I just have a ton of electronics in the buggy.
From top to bottom, left to right:

• Motor with 3 motor wires and sensor cable
• Temperature sensor
• Motor fan
• Battery, positive and negative wires
• Servo
• Transponder
• On/off switch
• ESC with fan
• External capacitor
• Receiver with antenna
• Voltage sensor