Ok, looked at a set of prints. 6S is an auxilary relay to 6 (there's a 6, 6A and a 6S) . It's considered and Up and Down Direction relay like H on an Otis. All four back contacts #'s 11-14 are in the gen shunt field circuit to short it out when car isn't running. The make contacts, #1 and #2 are in the 1 and 2 direction circuit and contact #3 starts AST timer.