if you are only getting 6-7 volts that sounds like it is your problem.
some of the 5.0 trucks had a small wire on the starter that acted like a trigger wire to actuate the starter mounted solenoid.
rarely in life do you meet a person that will drop everything to help a stranger,
and give the shirt off his back to a friend.
Steve Price was that kind of person.
Godspeed "window licker", the short bus will never be the same with you gone.