In a 1985 Jeep Grand Wagoneer, if the turn signal and high beam indicator lights illuminate when the parking or headlights are activated, it may indicate a grounding issue or a short circuit in the dashboard wiring. The dim gauge lights could suggest a problem with the dimmer switch or insufficient voltage reaching the gauge cluster. Inspect the wiring connections and grounds for corrosion or damage, and consider testing or replacing the dimmer switch. If the issue persists, consulting a wiring diagram may help in diagnosing the problem more accurately.
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