Okay BREWSKI and stam, I just received word from our Yale tech up here in WA, he says that I have an AISAN (not asian) converter/regulator, and that these units need to be drained of sludge every 100 hours. He is recommending that I buy a new unit as it has never to my knowledge been drained and I have been here for two plus years. I do not have a maintenance manual for this truck, and have no idea how to drain "sludge" from this unit. I am wondering if my AISAN unit has failed, how to test this, and how to drain the "sludge". Anyone have any idea? Thanks again!