Hello,Click here for the alternator wiring diagram
You are right that main alternator cable is unfused 25 square mm line running to the main starter connection
There must be battery voltage at the cable on the alternator side. Measure the voltage against battery ground. If you have voltage at the starter, it means cable from starter to alternator is faulty.
Hi,I do not see a reason why the alternator cable cannot be removed without removal of starter.Actually, the cable has a built in fuse. It is not available separately.
Click here for the alternator cable testing instructions