Here are my photos of the goings-on at the El Weekend '08, when we had five City-El electric bubble cars, two of them non-runners:
We fixed the fault in the first non-runner, which was blowing fuses due to a shorted transient suppression diode. The second one was also got running by fitting a replacement throttle pot and a switch. With temporary batteries installed, that one ran OK too.
I've included some of the photos of the people (and dogs) who were involved, as well as the cars.