A simple answer to your complex question is
"YES" most early vehicles were 6 volt and
could, may and did use the same battery in many cases. Vehicles using 12 volt systems became more common in the late 50's - 60's
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"
