where wires hook up to starter solenoid?

I seem to have an extra wire that goes to starter solenoid.  The wire that
goes from solenoid to starter motor is hook up and the small wire to the
small bolt is hooked up. But I have two big wires that look like one comes
from pos side of battery and other from neg side of battery.  How/where do
these two wires hook up at?  Person who took starter out and was suppose
to put it back in isn't reachable.