Ok . . . so I removed, cleaned and reinstalled the body ground.

no difference.

Next step (for the battery light that is coming on when the vehicle is shut off) is to check the altenator/regulator?

The Battery light is ONLY on when the vehicle is off.

New Ignition switch and cleaning body ground has made no difference . . . the only thing left that is connected to the battery light is the altenator . . . correct??

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1982 240
460,000 miles total
140,000 on Rebuild