This was helpful, thank you. Removing the battery holder was really difficult though, it took a lot of prying while trying to press four plastic tabs at once.
How did you get the single screw out of the middle shaft the goes to the control box? Mine has a nut holding it on from the inside (Makes me think it will just spin freely if I just try to unscrew it).
See here www.minelab.com/__files/f/414493/4901-0305-3%20Inst.%20Manual,%20VANQUISH%20440%20540%20EN_WEB.pdf Maybe coil connection is not good. Write to the vanquish support for help.