Brad, My dealer install the second batter before delivery, and it appears a hole saw was used to drilled through the battery box and compartment floor at the same time. My son in-law installed 2 6 volt batteries in his RV, and I still have trouble understanding the reverse the wiring concept (+ to - and - to + ). I know that is how you get 12 volts, but hooking thing up backward doesn't seem right. I guess I am just a 120 volt sparky, not a 12 volt.
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