Blinker on if pilot light off

[Toddyboy52]

Hey brand new we are working on a 55 fairlane converted to 12 volt. Black and yellow wire for pilot light both pilots come on. If the blinker is put on with pilot light it does not blink- if pilot light off then blinkers work. Is this the original design or are we missing something. I appreciate your help in advance. The blinkers do function with the headlights on.