One more question about my F150 5.o auto, when I got it it had a kill switch installed on it apparently because when you turned off the truck the electrical system would still run, the guy told me he was sure it was the starter does this sound right or what can i do to check/verify

also thank-you for the previous help on the oil pan

 

Sounds more like a hokey/bad install kill switch to me. Take it out of the picture and the problem might even go away .