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First check fuses. The parking lights and dash lights come on with the light switch, but have different fuses. if you have front lights( the switch is good), but no rear, check the grounds in the rear. They are usually mounted to the frame on the drivers side rear. As for the dash they have their own grounds. Places I know are at the steering column and behind the drivers side kick panel. You could also have problems at the plugs them selves, Corrosion. If you have no parking, brake, or reverse lights, it is a ground problem.
Here is something that might be related to your issue, carefully inspect fuse box under dash, driver side. See if it is wet/moist with oily liquid on fuse side and wire side behind. If it is, its brake fluid from the brake master pressure switch that has failed causing brake fluid to be pushed thru the wiring all the way to the fuse box , shorting out the electrical system. The repair would require replacing the brake master pressure switch with an updated pigtail (supplied with new switch), and replacing the complete fuse box assembly, and I would recommend cutting and splicing new wiring from the brake pressure switch to the fuse box.
THE OD LIGHT SHOULD ONLY BE LIT UP WHEN THE OD IS TURNED OFF LIKE WHEN YOUR TOWING. WHEN TOWING YOU DONT WANT THE OD ON .PUTS TOO MUCH STRESS ON TRANS. UNDER NORMAL OPPERATION THE LIGHT SHOULD BE OFF...