sr harness wiring problem?

[ZootedS13]

I used the frsport wiring guide.

http://www.frsport.com/SR20DET-Swap-Eng ... _t_26.html

the very last wire on the big chart for the large grey plug and small brown one it says blue/redstripe wire goes to any 12v switched. the problem is i have 2 blue/redstripe wires theres a very large one (id say about 8 gauge) and a small one (about an 18 gauge). do they both go to 12v switched or just the big one?