One day reciently, I turned on headlights and left front don't work low or high beam. Replaced bulb and still doesn't work. Checked plug on the truck and the terminal in the plug with a test light would blink for low beam and it would blink on the other terminal for high. So far have not seen any fuses or circuit breakers for the headlights at all! Found !!! The new bulb was bad also!!!! Works fine now!
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