Very unique problem...
 

Ok so heres whats goin on...
1) No overhead lighting
2) Spedometer dosent work
3) No Radio
4) Cruise control dosent work
Those are the ones i've found so far... Everyone keeps giving me diffrent answers about it, i've checked all the fuses, their all fine.

Any idea whats goin on here?

1993 Ford F150 straight-6

not too sure on that one but some of the older trucks have 2 power wires going into the fuse block and ive had one of them break off and do similar things to what you are describing

double check all your main grounds... had one come off the enging block one time and everytime i turned my headlights on my truck would go dead

I had a loose plug in my 2005 fuse box.....did the same thing. Hope yours is that easy...