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The 12 gauge purple wire on the starter runs through the bulk head connector and to the ignition switch mounted on the steering column.
The 12 gauge red wire on the headlamp switch also runs to the ignition switch.
The cause may be a loose bulk head connector, but I’d take a hard look at the ignition switch and the wires that run to it.
Email me direct and I’ll send you the Assembly manual wire schematic. I have it in a Jpg file that you can use. If you have Microsoft office you can zoom in and it will allow you to follow the wires with the pull hand. Email me at Willcoxcustomerservice@willcoxcorvette.c om