I am having problem with my recently purchased EL U33c unit. It runs OK with a small Lionel 80 watt transformer but when i run it on my MRC Dual power 027 -270 watt its horn goes off as it moves, sometime stops dead and in neutral the horn sounds continuously. I ordered a true blast II board but i can't figure out if it can be installed or how to install it. The units seems very sensitive to the lightest track issues as apposed to the lionel transformer. I have a ELs FM, SD 45, and PA AA units   with no issues with the MRC power. Any ideas

thx

Bob