I have been working on a 65 GTO and when I disconnected wires for the engine removal, something didn't look right. Fast forward 6 months with everything complete, my battery would go dead. Okay 5 yr old battery, went and got a new one, same thing. Now I knew I had connected a wrong wire to the battery side of the starter. Reading GTO Forum a member highly suggested your wiring diagram, which I purchased. The color diagram was very easy to follow and it help me resolve my problem. Best $21.00 I've spent in a long time.