Two equal 12v batterys front and bed of truck (slightly different age of year ish) powered by a 180amp alternator. With 550amp relay switch. How long will this take to fully charge both under normal (ish) driving conditions. I'll add the 2nd "bed" batt Is directly powering a 6kwatt (max) set of subs. Yes yes I know I need to add more amp at the alternator side and I promise I will..... before I add the other 3k watts... promise. Haha.
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