Factory Dual Batteries in a 2003 210?

[Shooter]

Anyone know how a stock 2003 SANTE 210 dual battery system is configured?

I have one battery under the rear port seat with wires running to the engine. I have another battery mounted under the bow with wires running to the rear along the port side. I have two battery switches (pictured below) under the helm. I purchased the boat used and would like to know if this looks like the factory set up. Does the factory system have a battery combiner or isolator installed somewhere?

I'm asking because I'm having issues with a newly installed maintainer that I have either installed incorrectly of is not working.

Thanks!

[DanielC]

In 2003, there was no standard way to mount two batteries. There was a lot of mid year changes being made on your model of boat, they could not even keep the same name.
Your basic boat hull was introduced in 1995, as a Nautique Super Sport. It was designed as a "family" boat, that had an acceptable ski wake at slalom speeds. The battery was in the front to help balance the boat. Wakeboarding had not really caught on yet. In 1997, Correct Craft introduces the "Launch control system" tanks that you could fill with water, to make the wake bigger. Later, in 1997, the first "Flight Control Tower" was introduced.
It so happened that as Wakeboarding became popular, the preferred wake was the one made by the Super Sport hull, or as it was called in 1998, the Super Air.
A lot of these boats also has a center mounted pylon, and if you pull up the center floorboard, it would not surprise me if you found a pylon mount under the floor.
Correct Craft made minor changes on these boats, but left the running surface alone, until 2007.
In 2003, Correct Craft introduced some new models, the 206, the 216, the 226. Correct Craft also decided to drop the "Super Air" name, and call the boat you own a 210. The Ski Nautique also got called a 196.
Sometime in the spring of 2003, ther was a huge outcry about calling the "Super Air" an "Air 210". The dealers got shipped a bunch of new decals with the word "Super", in the same font as the "Air 210" font, and the boat became renamed again the "Super Air 210"
2003 also saw the introduction of Signature, Limited, and Team edition boats.
Way more information than you probably wanted, but you could find 2003 Super Air or Super Sport with one battery, or two batteries, and you could have a single battery in the front, or under the back seat, one battery in the front, and one under the back seat like your boat, or two batteries in under the back seats. All are factory installations. They also changed the battery switches, and locations during this time.
Some time before 2003, the pylon mount was also moved to the back, just behind the back seat, and the center floor mounted pylon mount went away, but it could still be there on your boat.

[obd666]

as danielc points out, there was some variety in where the dual batteries were located that year. my 03 sante has a battery under both the left and right rear seat cushions, with a switch like the one pictured above for each battery ...

[core-rider]

I have two of the switches like you have pictured above, but they are mounted just behind the starbord battery under the rear seat. I also have another battery mounted on the port side. All of this was factory mounted when I ordered the dual battery option.

Best I can tell from taking apart those switches is they isolate the battery they are wired to disconnecting it from the electrical system. On the underside of the switches are aluminum bars that combine the power source. That way if one battery is turned off all your accesories still work.

As far as your maintainer goes, can you take it loose from the electrical system and test the output with a volt meter? If it is putting out proper voltage I would think your installation is incorrect.