6. Cylinder duster is now a 340 ignition issues wants to start when you let up on the key

So I know coming off the amp gauge in the dash. There's a red and black wire that go through the firewall in a small grommet. The red goes looks like to a fusible link to the starter relay and the black I believe goes around to that big white connector on the engine but I don't think I hooked it up to anything. It look like it might have went to. There's a spot where three or four wires are spliced together or welded together from the alternator wire, but I'm not sure yet till I get into it