battery charger

[captcrly]

1986 ODAY 40ft.
Does anybody know where the onboard battery charger is located on the boat? The previous owner installed refrigeration on the ice box and installed a third battery. I want to check the battery charger to find out if is working as my batteries drain very fast when refrigeration is used.
Thanks very much.

 

[Don S/V ILLusion]

Follow the wires.

There is no designated, single location for a battery charger especially on a 35 year old boat, which likely has had multiple previous owners.

While refrigerators vary, it's common to use 50 amp/24 hours depending on efficiency.