Leisure battery extra fuse box questions

[troglodisme]

I am installing an extra fuse box for my leisure battery and have made a diagram to make sure I know what I am doing. Could you please take a look a let me know what you think..

 

Questions:
- Is it ok to short the ignition amplifier wire with on the main 12v line as I am not going to control it from the van's key switch?
- The 3 pin toggle switches have very bright built in leds. How can I reduce their power without also reducing the power to the amp/fan/usb outlets? Can I have a resistor on the ground line?
- How do I know when I am over loading my leisure battery? Should I be monitoring how much current is been drawn somehow? 

Thanks

[Mocki]

Circuit looks fine for what it is .

yes adding a resistor to the -12vdc to the switch for the warning light will work to some extent , depending on what the illumination is provided by , it may not work with some leds , may just be better to defuse the light output with opac paint or self adhesive tape ? 

as for over loading you battery , I assume you mean flatterening it ?  You may add a volt meter , or a low voltage cut off device 

https://www.ebay.co.uk/itm/253014218917

if it’s a three way fridge the 12v should not be wired to a leisure battery ( other than the ignition if it has one ) it should be direct to the main battery via a alternator triggered relay 

[bigherb]

Rather than daisy chain the inputs use a 4 or 6 way single input fusebox. https://www.ebay.co.uk/itm/32V-4-Way-Bl ... SwZe9bM3E5

[troglodisme]

Thanks, that's much better! 

What about ground? Kind of long to daisy chain all those too. Is the ground from the leisure battery shared with the main battery? In other words can I use the ground from the chassis to complete the circuits shown here?

 

[bigherb]

Thanks, that's much better! 

What about ground? Kind of long to daisy chain all those too. Is the ground from the leisure battery shared with the main battery? In other words can I use the ground from the chassis to complete the circuits shown here?

Yes, that is the normal way of doing it. Leisure battery and starter battery both earthed to the body.