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I noticed tonight that my taillights were very dim compared to normal. After a little bit of troubleshooting, I noticed that my taillights are good as long as my instrument/map light switch is in the off position. If I switch that to either the instrument light or map light position, the taillights get noticeable dimmer. There does not seem to be any impact to the headlights brightness.

Looking at the wiring diagram that I put together some time ago in conjunction with the original Packard diagrams, the problem is not obvious. Has anyone else experienced this? My only thought right now is that it may be a bad/dirty ground connection, but I’m not sure where.

Thoughts?