[COBALT]

For the starter issue there should be a red and a yellow to the same side of your starter. The red goes up to the + side of the coil straight from the starter. The yellow one is actually one side of a parallel circuit that ties into the original wiring harness above the center of the firewall to a white wire (covered in fabric) that runs to your ignition switch system. The other side of this parallel circuit is also yellow, of the same guage, and runs to the + side of the coil along with the red (or it's supposed to). Therefore from a distance it looks as though the yellow wire is redundant, since it looks as though it runs the same path as the red one, but if you open the wiring harness above the firewall you'd discover it isn't.

Before the coil has induction for the distributor when the truck is running there needs to be power to the coil - hence the second yellow wire. When initially starting your truck the starter and the coil both need power. Once the truck is running only the coil needs it.

I found this out the hard way when the yellow wire that was supposed to connect to my starter from the coil was dangling loose, and was shorting out the circuit by grounding to the transmission flange. My truck would periodically miss out so bad it would quit every once in a while. When I unwrapped the wiring harness I figured it out.

Good luck.