questions about battery disconnect wiring

If you have the ammeter bypassed, you don't need to do that schematic. You are introducing another piece of equipment that is unnecessary to accomplish the function.

I explained here or elsewhere why that relay in the middle is a bad idea. Locks closed, the cut off does nothing because you have a loop.

Last time for me... ISOLATE THE CHARGE WIRE AND BATTERY SIDE FROM THE CAR FUNCTION SIDE AT THE CUTOFF

Here is a visual.
k1WUWfY.jpg

The brown line is the great wall of china here. No power on left side of wall when switch is thrown... DONE!!!!

The additional wire going forward to the starter relay weighs a whopping 4 pounds maximum. maximum 20ft at .146#/foot plus ends... More like 15-16 feet yikes.

24059 is what you use in my set up, not the one that has the ammeter in place.