...NIck.. thanks for post...
I have 2 12volt batteries .... does Gord's advice
prevail? ... i.e, if both batteries run down I would connect booster cables
from my spare "booster battery" to the positive on one of the 12 volt batteries and connect the negative to the other 12 volt battery. Having done this I would then set my battery switch to "both" and try to start the engine
Also: If I want to charge up my spare 12 volt "boost battery" (I have solar
panels) would I just do the same thing (as if I was going to boost the batteries to start the engine) and then would my solar charging
setup then charge all 3 batteries?
thanks in advance