So i purchased a 2006 honda fourtrax 350 es as spares or repair no spark, turned out to be the shift fork broken in the front casing and wasn't sparking becase it was stuck in gear, thats all sorted now im on to the next issue,not charging

this atv does not have a regulator/rectifier anywhere, not even a spare plug hanging for 1, anybody come across the issue before? Also when i put a battery on it i cat watch the volt meter going down very fast with just the ignition on. Can anybody help 👍