if you remove small wire on starter solenoid and couple batt lead and it still trys to start then solenoid is faulty [new starter needed] if it dosent try to start then it could be a short on solenoid feed wire-check from main starter lead that it has not rubbed through solenoid feed wire,also if it has a starter relay fitted this may be stuck closed-either way there must be a feed coming down this wire! may be ign switch wiring or switch itself.
k, January 2009