any thing at all eh, do you have a battery installed in the truck? if yes go to step 2
tools needed - volt meter
start by following the battery cable to the starter and measure and see if you get battery voltage there.. keep going till you get to the bulkhead connector. if you get power all the way to the bulkhead connector, do a voltage drop on the power and ground side of everything you just measured.
does anything work/turn on in the truck? is the ground cable connected, is the power cable connected, was it working before you did something what did it do before the problem. seriously we need more information. if i were you i would go buy a chilton or something like it for 15 bucks at the autoparts store, they have wiring diagrams in the back of the book.