Yuck....an electrical question

[don t. - 72gmc]

I am electrically challenged, please bear w/me. I'll try to make this as short and as descriptive as possible! Hope it makes sense!!

Running new 12 ga. wire to HEI batt post, no problem. The old wire came off a keyed hot from the fire wall. This hot was spliced, 1 going to HEI batt, other going to 'R' post on starter selenoid. This starter wire was older/hard, figured I'd replace. Also checked wire going to 'S' post on sel. This one was worse, missing insul. & bad splice near post. Followed this one up to firewall plug on left side. Except for the new HEI batt wire, I'll splice/solder the sel. wires from good material by firewall, s/b no big deal.

Question 1=>Unable to really tell by the service manual what the 'R' and 'S' post on sel. really mean/where they should connect.

Question 2=>I didn't have electrical problems b/4 I noticed the really bad 'S' wire. Anything I should worry about? should check "while im there"?

Thanks inadvance.....don t. .....

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It aint gonna be a trailer queen, its gotta work, just like me.
3/4 ton,350 w/HEI, 79 q-jet, th400.