2002 Club Car DS just stopped after installing 2 gauge wires

[seeyalatergator]

Ok, newbie here with a question. I replaced my batteries and everything was fine with the old cables. Then I replaced my cables with 2 gauge cables because the old ones looked pretty bad. The cart ran fine for maybe 15 minutes and just stopped. After reading on here, I realized I had to have something through the obc. So, I used a 5/16 carriage bolt, carefully following diagram I found posted here. Still no go. Reset obc per instructions on here. Still no go. Checked water. All good. Charging battery pack now for the first time. Charger needle went to the right and is humming like its supposed to. Each battery showed about 8.15 volts before charging. Forgot to mention it is a 48 volt with 6 8 volt batteries. Sorry for the long post, but is there something else I need to check as to why it won't move?