Starter solenoid question

[opfor2]

can someone tell me were all the wires go and what they do on a 90 Blazer's starter solenoid? I know a really dumb question but the only one that I really know were and what it does is the large wire going from the battery to the solenoid.

 

[4X4HIGH]

There should be another wire on the battery terminal that goes up to the firewall to the junction block just to the left of the master cylinder, there is also a small wire on the (S) terminal that goes to the ignition switch for cranking the starter.