"It is entirely plausible that Tesla made use of the alternator to continually recharge the Pierce Arrow’s single 12 volt automotive battery and help supply sufficient power to the electric motor."
https://www.apparentlyapparel.com/news/nikola-teslas-wireless-electric-automobile-explained
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"All the generator needed was an external energy source to start it up, after which it ran till someone stopped it or because of a mechanical failure. This Tesla mentions in his correspondence with Sava Kosanovic, March 1, 1941...
"I add that in the station one must have a small generator or battery of 30 volts for activation.""
https://nexusnewsfeed.com/article/science-futures/nikola-tesla-s-flying-saucer-electromagnetic-field-lift-experiments/
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"a tesla coil requires a high level of power source, and this can be provided by a transformer supplying the required amount of power in the range of thousand volts."
https://www.watelectrical.com/tesla-coil/
"If the Tesla coil was designed absolutely perfectly, it would actually be self-sufficient"
https://understandsolar.com/tesla-off-grid-generator/