The starter's mechanical 'relay' on a 90's caddy it attached to the starter, it is the solnoid and may be defective. Check your connections and harnesses for the smaller wires going to the solinoid. There probably is a standard electrical relay under the hood in the power distribution center, and it should be marked either in the owners manual or the top of the center lid itself. You can swap it out with another standard relay not needed like your ABS or horn relay to see of this is the problem.
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