Too long between your posts. You are moving too slow. If you got the cables at a known good vender, they are OK. You should use 0. 1 will work with a short cable. The mark you see is probably NOT the size. It's a tooling mark. Now answer some questions.
1. Is this GMC a positive ground system?
2. Do you know what positive ground means?
3. What is your positive battery cable attached to?
4. Do you have a foot start starter?
5. Who bench tested the starter? What kind of bench test? Just spin or a load test?
6. Who rebuilt the starter. What is the vendor and part number of the starter.
7. How many coils are you using?
8. What is your negative battery cable attached to?
9. Are you saying that the motor rebuilder did not start the motor? If not, do you know how he timed it?
10. Have you checked the static timing? Do you know how?
11. The "Tech Tip" you are using is not applicable to your situation. It deals with after it starts and fluid/fuel checks. You are not at that point yet.
Answer the questions and stay engaged with this post if you want help. Don't wait 5 days to answer. These questions are designed to start at the basic beginnings. Making sure we understand what you have. We will move to other areas and causes if needed. Answer carefully, completely.
Yes, when a starter can not turnover the motor and you keep trying, it will get HOT. So will the cables and the battery.
