3 Bank Charger, Multiple Vehicles

lathamb

Observer
I have a Pro-Nautic 40 amp 3 bank marine charger that I use to charge my 4Runner (dual AGM Batteries). This has worked well for years (my Diehard Platinum Group 31 Is on its way out after 8 years). My question is since its a 3 bank charger, I'd like to use it to charge batteries on other cars at the same time. I have one car that is driven rarely, and I'd like to top off my wife's suv battery periodically. Would there be an issue creating a common ground (splice 2 additional ground wires into the existing single ground the charger) and connect that common ground to 2 or three batteries in different vehicles, and run the remaining 2 positive leads on the charger to the other batteries? Basically have 3 positive leads and one common ground to 3 batteries on three vehicles. I have agm batteries on the other cars, so the battery type is the same, different brands. Would that work without frying something?
 

Alloy

Well-known member
Shouldn't be an issue. I use a 12-50P but I've never used it on multiple banks. I'm not sure if does prioritization. Like charing Bank 1 before charing Bank 2 & 3 or if it spits the chage between all 3 banks. Be worth a call to ProMariner
 

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