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How is the aux battery vented? I know you can run into corrosion issues with the main battery if the vent tube is disconnected or clogged and all the electronics in the area.
Pretty sure that's a sealed AGM battery that doesn't need venting.
I ran a standard lead acid battery in the left side. I got the plastic fittings that fit in the side, and a rubber hose from the auto parts stste and ran the hose out the front of the box, then down past the plastic splash shield. Never had a problem for the 3 years it was in.
Soooo, my big plans to use an aftermarket mesh grill didn't quite work out. I did a bumper/winch/light bar install for a customer.
the vent sections on the aftermarket grill are longer than OEM so it's not as slick. Check the pics. Also this is the first TP4X4 bumper installed in the US!