Mad Mike

I was at a reststop when my truck did want to turn on. It would turn over but not turn on, I have had this problem before it the Fuel Pump Relay that for some reasons need to be tilted in order for it to work. so i change the relay with the Horn relay and tilted 45 degrees and it works
but am getting sick of this because it unpredictable it could while off and while on the road
so what should I do?

F.y.i
my truck was in the repair shop like 3yrs and when I pick it up I notice that they jump started the truck because they didnt know how to turn it on. it turns on with the harzards lights on or left turn signal. then the Progressive told me that truck had a Spike on the electric system. what bull of **** right?