Modern Vespa

Running fine. Stopped for a couple minutes, no start

Don't hear pump prime
30A fuse good
Front relay chatters, swapped with relay behind it, still chatters
Indicator lights hit or miss, but CEL will come on momentarily then go out
Brake lights work
Battery at 12.66v

I am on vacation at campground so don't have access to my code reader or a wiring diagram

Seems like what ever pulls in relay is intermittent. I am thinking a faulty ignition switch or immobilized antenna

Ideas?

If the brake lights are AOK then the ignition switch is also OK. That relay is the headlight relay - one leg of the coil fed 12V from fuse 5, the other from the ECU. The ECU is fed its 12V via the ignition switch and then fuse 2 under the seat - that could be an intermittent contact, or the ECU connector could be making poor contact.

Good hunting!

Circuit diagram as jpg and as pdf, in the hope one of them is readable:

Thank you Jim! In the interest of the collective, I will post what the final resolution is but may be a while as I am in Maine and not home

Well it appears to be a battery issue. Thanks to CC Scooters in Kennebunk Maine got scooter transported back to campsite where I continued troubleshooting. Took battery to a nearby auto parts store to test. Battery is toast!
Getting new battery from CC Scooters tomorrow but confident that is the issue

Glad it was simple! Enjoy the rest of your trip.

Yeah. My bad. Didn't realize how old and no starting issues were reported to me by the rider.

Should have replaced over the winter. 10 lashes with a battery tender cable!! 😂😂