You can find the "cable upgrade kit" at
Ducati Parts by Desmo Times - The Home of DIY Ducati Maintenance.
For the charging voltage check, Shoeman is right: It'll allow you to check your regulator.
Stick a voltmeter on the battery. Start your engine. Let it warm, then rev it up to 4500/5000 rpms. Voltage must follow RPM's. If it doesn't, your regularor is K.O. If you read more than 15,5 /16 volts....the regulator is also good for the bin.
In the case your regualtor is fried, the electrex is cheaper than oem and seems to be reliable (
Electrex Systems), the ref is RR51.
RR51 - regulator rectifierregulator/rectifierDUCATICAGIVALAVERDA350SS400SS600SS750SS90 0SS500 PANTAH600750900 MONSTER748750F1
To conclude, check your Alternator/Regulator yellow wiring, especially the crappy white connector. This bullshit fries most of the time. Send it in the bin or at Guantanamo and solder wires.