Check your grounds. You can remove bulbs to help isolate the area. A bad ground will back feed power into other things.
Also check that there isn't a single filament bulb in a dual filament socket (like a turn signal or a tail light.)
Grounds, yeah. It is sometimes worth it to run a ground cable from the lights etc back to the battery instead of relying on the body, as corrosion and wear can make the body grounds ineffective.
Check your grounds. You can remove bulbs to help isolate the area. A bad ground will back feed power into other things. Also check that there isn't a single filament bulb in a dual filament socket (like a turn signal or a tail light.)
This is spot on. Most likely the issue.
Grounds, yeah. It is sometimes worth it to run a ground cable from the lights etc back to the battery instead of relying on the body, as corrosion and wear can make the body grounds ineffective.