Gizmo, yes, a bridge rectifier would nearly double the DC output - by doubling the load on the Victa ignition module. Bear in mind it was probably only designed to carry ignition current, and even the half wave rectifier might be making conditions stressful for it.
It may not matter in this application, but the bridge rectifier always has two diodes in the current path instead of one with the half wave. This reduces the output voltage by about 0.7 Volts. That is why it only "nearly" doubles the current.
