Electrical question and what is this device for?

[Dseg42]

Hello, I recently purchased around a 2006 Club Car DS and took the dash apart.
What is thing used for? It only had one wire connected to it but I have no idea what it is. Pics below.
Also, how do ppl usually run 12v in a 48v car?
Right now, the headlights are connected to a single 12v battery but I read you can’t do that because you dont use the batteries evenly. I was going to get a converter, connect it to ends of the series to get 48v, which goes to 12v.
Do I need a kill switch that cuts power to the converter?

Wont let me post pics because im new.
So put https:// in front of this lol
ibb.co/Hq83Yng
ibb.co/dJc3RhD

[Budule]

reverse buzzer me thinks...
and this reducer....

https://www.cartsunlimited.net/12v-reducers.html

you can wire it with key on or off....

should have two wire to the buzzer , somebody unplugged it because they be annoying.... its a good idea to have it but i stuck a foam earplug in mine to muffle it...

[Dseg42]

Originally Posted by Budule

reverse buzzer me thinks...
and this reducer....

you can wire it with key on or off....

Thanks. I bought this:

DPLANET 30A 360W 12v Golf Cart 48V 36V to 12V Converter Voltage Regulator Golf Cart Voltage Converter Waterproof

If you put amazon dot com and add:
/dp/B07J274LZD/ref=cm_sw_r_cp_api_glt_fabc_8BX7K6JD1AACSMANENVJ
You should be able to see what I got.

Is that the same thing?

[Budule]

that be one ! should be good.... that other wire for the buzzer its probably dangling in there somewhere....