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Electrical information regarding a tent trailer? - when buying a tent trailer ontario

I bought a tent trailer Flagstaff in 1996 and do not have the necessary wiring to connect it to my car. I understand that all electrical connections are done, but wondered about the battery in the house existing system. The cable you do not need to go directly to the battery connected, but in the trailer, I'll take it to investors. Why do you charge the battery? If the cable is connected to 12 volts to the converter, regulated at the moment? If not, how it is regulated? Thank you for your attention.