Yes, you are correct about needing a positive to positive, and a negative to negative connection between your batteries.
If you dont have a lead that will suffice for the 2nd required jumper, you should be able to purchase the approximate length at an auto parts store. Those two jumper leads are supposed to be 2/0 awg size (big stuff!).
You should connect a black 2/0 wire from either negative battery terminal to the frame.
You should find a red 2/0 wire that disappears into the coach inards, heading for your coach disconnect relay in your power compartment. Don't worry about where it goes, just so long as it is 2/0 big, and red. Connect that to either positive battery terminal.
Your last lead is a smaller, 4 guage, red wire which also gets attached to either positive battery terminal. This is the charge circuit coming from an 80 amp breaker in the same power compartment as the disconnect relay. Also, don't worry about where it goes so long as it is not so big & red.
This is all that is required to switch from 6 volt batteries to 12 volt. Just don't drop a wrench or screwdriver across the terminals!!! Ha Ha Ha...
Let us know how you make out.
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