It sounds like you might be trying to add a wiring harness to tow a trailer with your 1971 Cadillac Eldorado and there is not a custom harness for this vehicle, but you could use the Curt Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 60" Wire Lead # C58044 and hard wire one in. This would be the only available solution to accomplish this.
I've linked an installation video of this that you can use as a rough guide during the process, as well as a helpful article we did on... view full answer...
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