69 swinger under dash wire harness ??

Is your fuse box still mounted in the correct place under the dash just to the left of the E brake handle mount. Right there where the harness goes into the fuse box just coming out of the electrical tape that the harness is wrapped in, should be those 3 wires and their connector ends. The relay is right there mounted to the inside of the left side kick panel. You might have to unwrap some of the tape and go back up the loom a ways to see if they were in fact cut off, but that's right where they should be coming out of the harness.