Dial light wire (orange) for this AM Radio?

Saved this Mopar AM radio from a '65 Valiant I sold in 1980. The radio may have been a '64 model (dealer installed?) based on the round-style push buttons.

Anyway, my '65 Formula S wiring harness has a red wire and an orange wire coming from the fuse box for a radio. The red wire must be the hot wire, the orange wire should be for dash/display/dial lamps.

This radio with the round push buttons has three wires coming out from the drivers side of the case. Two wires (brown and brown with yellow tracer) are together, one with a male spade, the other with a female spade. I assume the brown wires are speaker wires (see foto where I plugged them into the speaker).

The third wire exiting that corner of the radio is black with a male spade, I assume that is the hot wire.

Another black wire is attached to a screw on the rear of the radio case, I assume that is the ground wire.

Observing from the outside, there are no more wires and so I find no connection for the orange dial lamp wire. The only things I can think of is the dial is always lit on this model radio, or the orange wire is missing (although I don't see where it would have exited the radio case).

Anyone use these old factory original AM radios know the scoop on the wiring? Thank you.

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