Hey Powercat....I know it is an old post but still highly relevant. I am referring to your BIM work around when adding lithium batteries to your RV. I came up with the same solution but was not sure if connecting the ignition and gen connections together would be an issue. Your diode blocks solves that problem. My question is in your post you included a schematic of your changes for the diode. What I am not sure about is the changes you make in the bottom right corner where it shows another cut wire...what was that for and is it required to make the diode trick work? Thanks again for a great solution. I was starting to think I would need to buy a second charger to keep starting battery up when plugged in...