They ground at G200. Are you sure that the radio bulbs weren’t half out to begin with? If they were all still working, that would be a rare case unless you had replaced them earlier. That only some would suddenly go out would make me wonder if the antenna wire was disconnected and the end hit the radio chassis—I’ve heard that can cause issues with the circuit board but maybe others can confirm.
Anyways, here are the diagrams for a 1998. Hope it helps.
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