95 s-10 blazer, installed new wiring harness with multifunction switch. now it tries to start without key. need help troubleshooting

 

Are you saying that now whenever the battery is connected, the engine cranks?

Start with removing disconnecting the MFS harness and see if it does it, then connect them one at a time.

Isnt the ign switch separate on your truck?

 

replaced ignition switch that fixed problem. thanks for help