When you say "direct install" do you mean LED tubes that are used as direct replacements for flourescents without the need to bypass the ballast?
If the answer is yes and it were me I would drop the light fixture and check that you are getting 12vdc on the inlet.
Cheers
Wayne
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Wayne & Christine: 2002 Pace Arrow 36R
Molly, Maggie, & Mookie (Tres Amigos)
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