1971 Duster parking lamp housing harness

[hemi68charger]

Hey ya'll...

Curious, helping a buddy with some trouble shooting. I am not all that knowledgeable about A's....... But, the plug connection on the back of the parking lamp housing on a '71 Duster 340 with the Sharktooth grille had a two pin connecton ( like a dual bullet ), both black with one having a yellow tracer and the other a tan....... If this is the case, how is the housing grounded? I mean, the grille assembly is plastic, no?

Thanks in advance and a picture would be GREAT !!!

 

[no poseur]

it's grounded thru the harness at the radiator support.

 

[Oldmanmopar]

There is a tab for a ground wire on the socket.