Ford Expedition 2000
Light bulb is goog, but the left brake light and signal light not working
Does it have trailer light plug. After market trailer plugs cause all kinds of problems and should be removed and replaced when they do. Also check the bulb in another socket to make absolutely sure it is bad. I have been fooled more than once by newer bulbs that break connection towards the bottom and you can't see it
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Thank you
I don't have a trailer, but I will try another bulb
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