Installing the True Blast II card solved the problem, thanks for your help

BOb

Thanks, can i splice the true blast wire in and remove the old sound board?

Thank you for your response. The unit has horn only. I did notice last night when the 'horn' goes off when the engine is idling, I can stop the horn for a while by pushing the the "Bell" button. Regarding where to plug the True Blast card, which  is the sound card, the one glued to the bottom of the chassis or the one mounted perpendicular to the chassis. Can you send me a diagram via email which card it is?
Thanks for your help.
Happy Holidays

Bob

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