The power junction block is designed as a multiple power feed center to?supply power to accessories that have a heavier current draw and need to be connected directly to the battery. This can be any item where the accessory manufacturer recommends connecting directly to the starter or battery for power. These are items like Power Locks, Power Windows, Cooling fans, A/C, aftermarket distributor system and / or sound systems.?This device helps when you have too many connections on a short starter solenoid stud. It really cleans up an already crowded starter battery terminal.