help! '82 bad ground

[Simplstupd at aol.com]

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The Gremlins have entered my Coupe.  I have no parking lights, dash lights,
or tag lights.

*All* other lights ok.

I can "get" the parking lights/dash/tag lights to come on if I:

1. Pull and hold the dimmer switch.    or
2.  Select reverse

I have tried a lot of different switches to no avail.  I have been searching
for grounds for three days...

Plus, the lights have come on mysteriously twice now while driving.

What am I missing?

Paul
'82 Coupe
Orlando