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Its a 75 coupe with air, for thirty some odd years i have been using the yellow connector as a keyed power source for the radio.
The other two wires are black and gray. Looking at the wiring diagrams and don't see a connector with yellow, black,gray wires on it.
Not really sure what it was for, everything is working ok, just want to find out.
Thank you for jogging my memory, that is the original connector for the radio, all i am using is the yellow wire.
Been so long i forgot about it, think i will use that ground instead of my current one which is attached to the console.
Doc Rebuild's Dash Harness drawing, yes i have seem it.
Thanks for the info