Re: 70 GMC parking lights in grill don't come on
I had a similar situation in my 70 Chev. I had to run extra ground wires to those lights. I made a "pig tail" which was a wire with a ring terminal on both ends. One end went under the head of one of the light's mounting bolts. I found an original hole in the radiator support. That's where I put the other one with the help of an extra bolt.
Try touching a scrap of wire by hand to see if that fixes it temporarily.
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