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There were a few mules equipped with a factory electric start but they're pretty rare. I'd bet 99% of the mules you see at events have been added.
Here are a few threads from the G discussing the electric start and the battery boxes...
Are you asking what the first year was that the military bought mules with electric starters? I think it's either '68 or '70, on a few A5's.
I do not think there were very many factory electric start mules. If you're trying to copy the factory style, there's a box that mounts on the steering...