What is the year of your truck and which engine do you have?
"Today i left and i got half a mile when the pump dies, the power steering/brakes go out, and my check battery and check oil light come on."
If the engine dies the items you mention will go out, so if you are accurately describing your problem that is a normal condition.
There isn't a single relay controlling all those items. At the top of this forum there is a link to some shop manuals, use them to find information specific to your vehicle.
I'm not clear if you have returned everything back to normal and you still have the problem?
How did you wire the kill switch? Hope you didn't kill your computer in the process.
Clifton