On a '93 that's a unique circuit. With the previous years that wire ran through an 8-place firewall connector where you could check its continuity to the alt.
What you need to do first is separate the alt from the D+ wire in the suspect list. Do that by grounding the D+ wire (not to the alt case!!) and then testing to see if the warning lights work again with key on.
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Art Benstein near Baltimore
"If you associate enough with older people who enjoy their lives, you will gain the possibility for a full life." -Margaret Mead
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