Installing MSD6AL

Dillon Crowell said

The yellow wire seems like it’s the switched, there is a bigger red wire coming into it from the starter relay which is the power.

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Yellow wire WHERE?? At the start relay? If so that is the START wire, and it only goes ONLY GOES to the start relay. That wire is in fact what activates the relay when the key is twisted to start. The remaining small wire is grounded by the neutral switch in park / neutral