concern over battery banks

[halkading]

The chassis batteries on my LX 40 had a 1/2 amp draw with everything off so I decided to rewire the batteries to be able to shut them off independently. I have added two more perko switches to the existing one. One switch is for the two chassis batteries and two for the four coach batteries. I am able to shorten some of the cables with more direct routing and hopefully less voltage loss.

Discovered the coach batteries have no direct negative tie to the alternator or engine block for charging. It is apparently accomplished through a shunt in the inverter/charger. Inverter/charger instructions say not to connect the coach battery negative to the chassis, yet a few pages later a drawing shows both sets of battery negatives connected to the chassis ground system. What is correct for a 2003 LX 40? I do not have schematics showing coach battery and inverter wiring.

David, thanks for identifying the fuse for me.