Hello, When i crank my truck up my wipers turn on without turn the switch. Can someone please tell me ways to trouble shoot this? THANKS

 

Sounds like you have a short in the switch to me. I've had to have the switch replaced in both a 97 F150 and a 97 Mercury Grand Marquis due to shorting out.

 

The crazy thing is i unplugged the switch and it still does it.

 

bump??? maybe a WIPER SENSOR?

 

As wipers, depending on year can be difficult, suggest getting a manual for the job. My 02 has a high/low relay, run/park relay, Generic elect module, let alone the wiper motor and multifunction switch. As you can see, its not an easy thing to diognose, the repair will end up being simple, but its best thing get a manual.