Large wire goes directly to the batt pos terminal. One of the small wires comes from the key. Use a testlight and see if the small wire has juice when key is in start pos. Check all the connections. Let us know
The black wire with the white stripe goes to the small (+) terminal on the solenoid. The other small one must be a ground. Try jumping with a 10-gauge wire from the starter cable to the + terminal on the solenoid - starter should run (hold the wire on the solenoid terminal & jam the other end on the battery cable terminal - it's gonna spark!).
If the ignition's on, the engine should start. Make sure it's not in gear though.