Here is mine
I have a dual alternator, dual battery setup in my 10.
The system is setup like this-----main battery Odyssey 925 charged by 60A alternator (and assorted switches, breakers, lights and regulator etc) and the aux battery is a Odyssey 680, charged by a SD8 (again with necessary stuff).
I have a Schottky diode that allows current to flow from the main buss to the aux buss. This is unswitched and automatically allows current to flow from the main to the aux anytime the master is on.
My aux buss supplies power directly (through breakers) to the dual GRT EFIS screens, AHRS, magnetometers, and the radio stack. These are the things I consider as minimum equipment for safe flight.
The balance of the electrical load is hooked up to the main buss through the normal setup of breakers and switches.
I do have a battery cross tie contactor in case I run down the main batt, it parallels the two batteries to (hopefully) be able to start the engine. Of course if I have run down the main batt trying to start the engine, I suspect that the aux battery is not going to do the job either, until I correct the condition causing the non start.
I can turn on either the main, or aux battery switch, and the EFIS and radios are powered up. If both switches are on, I can turn off either and the EFIS/radio never misses a beat.
Starting procedure is to engage the Aux power until the EFIS comes online, and I have oil pressure and fuel pressure indicators working. Then I turn on the Main power, and start the engine. The starter load is isolated from the EFIS power, so the screens do not brown out.
I have an indicator light for a failure of either alternator, and can shut off either power feed as needed if there is an alternator fault.
If I had the magic Horton power, I would make up a nice drawing and post it, but sadly I do not