The only 'proper' way to fix this is ti replace the ignition coil - the wire is not replaceable seperately.
You CAN repair the wire in the same way as you would any other wire - with an electrical 'chocolate block' type of connector. Insulate it PROPERLY - there is 15,000 volts going through it!
phil_saunders(a)bigfoot.com
Phil Saunders, September 2009