If your not charging the low voltage will effect your TCI. I might suggest you fully charge the battery then unplug the reg/rec and see how it runs. If this gets it running then more testing of your charging system is required.
If your reg/rec is the issue then the 3 phase rectifier and the Fiat regulator is an inexpensive way to fix it. I have that set up n the 75.
If it doesn't run then more testing on the ignition system is needed. It could be dirty connections on the wiring or dirty contacts in the ignition switch or kill switch.
azman, What's a Gonzo box?
Leo