Juan,
I used 8 AWG, with heavy duty "starter" lugs (1/4" and M8). Power lugs are overkill.
RC recommends 6 AWG because he says there's no good crimper for no. 8 lugs.
Don't forget also about grounding the alternator frame ground (#10 stud) to the bell housing (M8 bolt.)
Ken K
I used 8 AWG, with heavy duty "starter" lugs (1/4" and M8). Power lugs are overkill.
RC recommends 6 AWG because he says there's no good crimper for no. 8 lugs.
Don't forget also about grounding the alternator frame ground (#10 stud) to the bell housing (M8 bolt.)
Ken K