You might consider popping the covers off the lights and pull the bulbs, checking for dirt or corrosion. I once had a single clearance light that failed to work and while checking the bulb I noticed both bulb and fixture electrical connections were slightly corroded. Cleaned both with electrical contact cleaner and a touch with a Dremel wire brush, re-assembled everything, and it worked as advertised.
Next time I need to do that I'll go an extra step to prevent future corrosion by using a little di-electric grease during the re-assembly.
It may be unlikely that ALL of your clearance lights would have corrosion problems, but since your rig is a several years old, its a possibility.
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2016 Minnie Winnie 27Q on a 2015 Ford E450 chassis. Retired U.S. Air Force. Lived in Anchorage, Alaska for 30+ years. Now Living in Deming, NM.
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