Your missing a number in your models number. From what I see they built a 290 BH and a 2910 BH, not that it matters for this issue but it could in a future query. Easiest thing is to go to the UserCP and create a signature with the trailer and truck make, model and year so that question is automatically answered.
From your post it sounds like you are throwing parts at it and not diagnosing the problem. So first off, do you have a multimeter and know how to use it?
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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