[PDF] MSD 6 Series Installation Instructions 6A, 6AL, 6T, 6BTM Injection Adapter to use an MSD Ignition. See pages 7 for wiring and Tach Adapter information. Note: Vehicles originally equipped with a CD ignition control cannot use an MSD. SPARK PLUGS AND WIRES Spark plug wires are very important to the operation of your ignition system. A good quality, Technical - EZ Wiring Harness installation advice | The H Jun 24, 2016EZ wiring does not send complete wiring diagram with harness. They give alt, ignition switch wiring for different makes, but that's about all. Now for your question. The 10 gauge red wire should hook directly to battery, normally at the post on the solenoid. GM uses red wires for hot all the time and pink wires for ignition hot.