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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
My info is limited on your model here but I see no one else has responded and thought I would see if I can help here.
Inspect the wiring running to the rear lights especially if you have any trailer wiring installed for any wiring shorts or wiring damage as this will cause an issue like this here.If any issues are found with any of the wiring this will need to be repaired to correct this fault here.Usually you will find corroded or damaged wiring at the rear of the vehicles near the lights.
If this is all checked or was already checked and found o.k. let me know.
Have you inspected wiring under the dash from the light switch and steering column at all for any damage needing repaired?
With my info being limited on this as it is an older model and the diagrams are difficult to locate and you have checked and made sure all wiring is o.k. as well as replaced the light and turn signal switch and no issues were found this may be a poor ground issue.Check and make sure the ground wiring from the battery to where it runs and leads to the engine and body is all o.k.I have seen poor ground connections cause issues like this before needing corrected to resolve this fault here.