Are you doing anything like [MENTION=57546]4-Ripcord[/MENTION] Acrylic layout HERE? Then it looks like no you wouldn't.
But if all you're doing is "upgrading" what's there, then I think you should be able to leave it. It shouldn't hurt anything. Unless I'm missing something, it's going directly from the pos. terminal to the alt. so if you leave it all you're doing is running a parallel run of wire.
I left the Stock wire unhooked. I just used some shrink wrap and covered it and zip tied it to a side wire. I didn't want it diluting my voltage since I didn't know where else it goes. I don't believe I put a fuse inline but I can check today.
Ive done about every power mod you can do including the cs-144 alternator.
(solar panel, dual battery, big 3, cs144)
Its super simple. all you need is 3 3/8 washers and I bought the chevy to Toyota adaptor for simplicity. That's it. Took me like 30min at most.
http://www.toyota-4runner.org/1879793-post57.html
I haven't done the big3 on my truck but I did do it to my civic which has old school amps. I ran 4g wire from alt to battery along with the oem harness. Electricity will take the path of least resistance so....you should be fine using both.
Thus being the 2gauge wire.
Yes sir. I used 4ga on the Honda because it's real puny. But, you will need a inline fuse from the alt to batt.
But, you will need a inline fuse from the alt to batt.