stan2004 - Yes, that is the correct EZ Street vehicle. The LED is a standard 3mm Red Color Diffuse Flashing LED from LED Switch. The five light circuit did function properly when bench tested with a constant DC power source.
Bob - I think you are on to the cause of my problem. I am planning on rewiring them in parallel as you stated. I am hoping that solves the problem.
GRJ - I am leaving the rectifier alone and do not plan on running them in reverse, so that should not be an issue. I chose the DC power as I seem to remember Lee Willis advocating that for finer control over the Streets vehicles. Didn't you develop a small constant voltage board sometime in the last several years? I seem to remember reading about it. Would that be a suitable way for constant voltage to the LED's?
Dennis