Simple field box electrical problem 12v/24v
Hello everyone
I've got a seemingly simple problem to solve... In my new field box setup, I have two small 12v batteries. My idea is to wire the two batteries in parallel for the majority of the time,supplying plenty of 12v capacity for normal field box stuff (panel, starter, pump, etc) but have 24v available for when larger engines get stubborn & need to meet the Dynatron starter. I'd like to not have to pull the batteries, add a jumper, etc... a pair of banana receptacles on the side would be great. In my attempts of drawing the circuit capable of what I'm after I either short a battery, have uneven drain between the two batteries when using 12v, or end up with waaaay too many switches.
Any ideas from the throngs of people more knowledgable about electronics than me??
thanks!