homelite 179cc power washer ignition help

hello,
 
no spark. disconnected black lead to the small electric box near the on/off switch. got spark. runs. then can shut off by grounding the "Y" side of the wire. basically black wire comes from ignition, goes to a "Y". One side to switch other to the electrical box.
 
 
would this mean I need to replace the switch or the metal electrical box?

Without the engine numbers it is a guess but it sounds either Honda or Chonda. Most those little box simply a low oil level control. Many on the Honda the low oil sensor in the engine goes bad and needs replacing; although, the engine can be ran without the oil sensor as long as you keep the oil level checked. You would however need to disconnect the oil level sensor and leave the engine stop switch connected for shutdown when you want it the engine to stop running.