Guess what--I may have an extra one. Please see my post at "350SD Cruise Control." Mine doesn't work and I thought I knew the situation well enough to go out and buy an amplifier. I guess it is a dose of humility or reality: nada, still doesn't work. Anyway, I bought one for $155--005 545 05 32--plus $25 core and now I am stuck. I have two. I'm not sure what I'm going to do, but it is likely that both my amplifiers work...