Outer Limits 4x4 Board

Hi guys, hope someone can help me. When my window lock switch is on lock everything is fine, its when i unlock the switch to put power to all windows it blows the fuse. Ihave unplugged the motors and switches one by one and still dose it ,any ideas. thanks.

sounds like you have an earth some where mate.

Get a mutli meter and start looking for it.

You know what to look for with the voltages?