Here's a run-down on the central-earth ground system I've created for The Shuttle.

I fabricated a small mount for the copper plate using a 1" x 3" steel bar which I drilled so that it bolts the alternator mount. I also drilled and tapped this steel bar on which to secure the copper plate.  The copper plate was drilled and tapped to 8-32 machine screws which are used to secure the individual wires (8 gauge stereo power cables) which run to the following components / locations listed below.  After cutting each cable to fit, I soldered a ring terminal to both ends of each 8 gauge cable.  And finally, I ran a 2 gauge cable from the copper plate to the ground distribution point located under the rear seat.  This distribution point is further connected to the battery via more 2 gauge cable, and also provides a few 8 gauge wires which provide additional grounding to the metal chassis and factory ground points located under the dash. 

• Ignition coil
• Throttle Body
• Igniter assembly
• Windshield wiper motor
• Both factory ground points located on both left and right side of the engine compartment

Total cost was about $50 for the various cables, gold-plated lugs, and copper plate. No crimp connections for me.  Rather, all cables are soldered for long-lasting and reliable electrical continuity.  And, for those who may be wondering how I solder 8 and especially 2 gauge wire, you'll be happy to know that a plumber's propane torch, set to a very small flame, of course, works quite well. Please let me know what you think...

I've also created another central ground point under the rear seat for all the components under the dash and inside the vehicle's interior.