68 Taillights are different than my current 67.
However, the upside down Christmas tree symbol is ground. So each lamp is grounded to the body directly. No wire.
View attachment 1716183307
While grounding can be an issue, the problem at hand is on the feed side.
Let's go over the findings:
Power in L17 and and L7 with the switch off. But only the rear lights are on.
Do parking lights work with switch on?
Do the rear lights turn on with the connector (or just the one terminal) removed from the headlight connector?
Dome light fuse is missing one and has one damaged wire.
Dome light doesn't work.
Personally I might do a little more testing for hot, for example in the front parking circuit and in the dome light circuit.
This would be to try to determine which circuit and location areas could be a cross wire short.
edit: The steps in the
above post are very clear and I suggest you follow them
At some point you will need to address the fuse box. Disconnect the battery and seperate or partially seperate the fusebox from the harness.
The terminals on the feed side slip off. If you have to do the circuits out (other side) will require removing the fuses and releasing the fuse holder clips.
Look at the power feed to the box (Red with tracer) for pinching or contact to the L17 and also the other wires.