Well...if ur alternator is putting out 15/16v thats high
But sounds like you have a connection issues.
Should have a thick guage wire 0/2/4/6 feed from main battery terminal location , then ran to the new battery location.
Then same gauge wire 0/2/4/6 to a solid ground location. (Cleaned, sanded) like to use a spot on the unibody frame.
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