Ok, Let's see. First of all, use the lt blue wire to activate a starter relay or you are going to burn something up. Just a simple automotive relay will work. Use the relay to power the "solenoid" in the starter. It has nothing to do with lights.
As for your marker lights, if you have power, you are missing the ground. If you painted your core support seperately, then put it back on, you have bad grounds. That probably also goes for the dash lights.
The black wire that went to the proportioning valve is for the brake system warning switch. If something went wrong with the brakes, it is supposed to ground out and turn on the brake warning light. Do with it what you please.
It ain't fun till bad grounds start to turn things on.
If at first you don't succeed, use a bigger hammer.