Not to jump Jackd's train, but since today is Sat. you probably want to tackle this this weekend. Yes you have to run a new line from the battery. Easiest way is to use a crimp ring terminal on the battery end that will slide over the bolt for the post clamp. You can buy inline fuse links of several types at any auto store. Installation is as easy as wiring it inline with your new wire, with the fuse position close to the battery to make it easy to find and change. Crimp connectors are the way to go. Good luck.
1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick