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These are the Important must haves. "Frame is the GND."
Battery to frame,
motor/starter to frame
Birdcage to frame, (small gnd braid located app. under dimmer switch, under car)
Main Interior Harness to birdcage
Interior gnd to birdcage, Light switch, Speed-o,and Tach, Instrument cluster, Wiper switch, parking brake.
Light harnesses front and back to frame.
Gas Gauge Gnd.
alt. to Frame
Engine compartment, Wiper motor, Blower Motor, Headlights, and horns.
thats most of them,
on a corvette if it used Electrical power you better have a known good Gnd.
69VETT