Only the Left parking lights (front and back) are out.

[SabaDabaDoo]

1980 Targa: Checked the fuse (#4) and the bulbs: all good.

Installed a different turn signal stalk: no resolution.

Help

 

 

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[dmathews]

Did you ever get this figured out - I know it's been a year, but I like responses...

 

Near the rear lights under the vehicle above the bumper mounts is a ground.  Remove the nut, use a wire brush on the body bolt and wire connector and torque down the nut again.  This can cause some instances of lights not going out.  Typically you see this after a re-paint where the threads are covered in paint and not providing a good ground.

 

Front light grounds are inside the frunk on my older cars, assuming the same on the G body.  Report back what you find!

[Gawerker]

Bad diode between headlamp switch and flasher relay part# 911.617.108.00