On my 99, the ground wire connects to the radio chassis. It is on the left with a female spade connector. The male spade connector is on the metal surround also on the left. I think the color is black/green, but I wouldn't swear to that. It's short. Only about 4~6 inches is accessible.
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1999 Boxster Zenith Blue Metallic/Savanna Beige
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