Last year I installed a nitrous kit, digital fuel pressure and nitrous pressure gauges, purge valve, and shift light. It was my first experience wiring that many things. I hooked all of the 12 volt source wires to different fuses in the fuse panel. After I finished my horn and cruise control no longer worked. Everything else worked with the exception of the fuel pressure gauge. It’s the weirdest thing, it works in the morning when I first start the car, but it will stop working after a few hours. This winter I rewired everything and tested all the connections with a test light. This time I managed to somehow mess up my blinkers. They don’t work at all! I found a thick wire with a black plastic connecter that wasn’t connected to anything. I believe it connected to the main harness that runs to the steering wheel area or headlight switch. I can’t find where it could possibly connect to. I would greatly appreciate any help or suggestions for solving any of these problems. I put the insurance on my car June 1 and haven't been able to drive it