Broken wires

Hi guys, been having a problems with opening my trunk via fob, interior switch or outside handle.The only way is to use a key.Quick google search turned out to be broken wires that got stuck in trunk tube(common problem in E60)

Can anyone tell me is the amperage same on all wires there?I'm going to use heat shrink butt connectors and crimp them but they come in different amperage range(5,10,35 Amp etc)and I dont want to mess anything there(melted connectors etc)

Broken wires:
-brown
-yellew
-grey/yellow
-grey/black
-grey/brown

picture(not mine but showing same problem)

http://i2.minus.com/jHQj9yGSQHKeV.JPG

Thanks guys,
Jacob