help truck wont start

[gtp2fast4u]

It wont even crank. Just when I turn the key, nothing.

Me and my buddy installed power windows on it yesterday. We wired them into the heated seats fuse, cause id ont have heated seats. The windows worked fine.

After we finished, I went to leave and the car wouldnt start. The battery is fine.. the headlights come on full, radio works, AC works, dash lights work. We even used a voltmeter and the BATTERY IS FINE.
Next we checked the fuses. All the fuses in both fuse boxes are good. Upon further inspection though, the fuses in the cab for the engine relay, the starter, and the cluster 1 aren't getting any power. Both of the fuses are fine, but they arent getting any power (we tested them)

Next we went under the hood and checked the fuse relays. We arent sure how to test them, or which ones to check.

or could there be a fusable line or something like that after the fusebox

Help! What do I do now? What c ould the possible problems be, and how do i fix them?

[crazy Jim]

first disconnect what you added and see if that helps. If it still will not start go back over everything you touched to see if you may have pulled a connection loose or broken a wire.

[gtp2fast4u]

already disconected everything, and tried that, still no luck

[1thunder]

what year and model truck is this

[rhandwor]

Use a volt meter and check the battery voltage. I think what you hooked up didn't shut off and drained the battery. If you have good battery voltage check grounds and connections at the battery. Then check the starter to check if it is getting voltage.

[troy1]

What year dakota? My old 92 did this once. There was a wire that corroded off under the windsheild wiper bottle on the fender. If its newer they moved the bottle so this would more than likely not be your problem.