1957 Backup Lights only when lights are on?

[TbirdFan76]

Should the backup lights always turn on when in reverse like modern cars or only when head & taillights are on?

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[TJShea]

Should the backup lights always turn on when in reverse like modern cars or only when head & taillights are on?

Mine only come on when the lights are on.

 

[Dick Rupp]

The back up lights only come on when the lights are on.