Quote:
Originally Posted by DeadheadNM
...imagine I'll need to bump that up to 140 once I get both batteries installed.
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I don't think so. Having two batteries doesn't mean you'll consume anymore electrical energy. But if both batteries are drained significantly, any alternator will struggle to maintain proper voltage.
Personally I consider the extra battery to act a "buffer" for heavy electrical loads. It allows to alternator to work moderately for a longer duration to recharge the batteries, rather than working to it's limits for a short duration.