How to Connect Two RV Auxiliary Batteriesby James Stevens
Recreational vehicle auxiliary batteries are useful as they ensure that, despite using battery energy to power your RV electrical items while you park overnight, you can start your RV engine next day. The best way to provide extra battery capacity is to wire your RV auxiliary batteries in parallel. You get the same voltage that your RV needs, but you double up on capacity.
Open your auxiliary battery compartment in your RV. It’s usually close to the main battery area. You find there’s plenty of space to position two batteries so put them in the space provided.
Use a new battery cable, preferably red or white as it makes identification easier, and connect one end to the positive terminal of the first auxiliary battery using a suitably sized wrench. The positive terminal is labeled “+.” Connect the opposite end to the positive terminal on the second auxiliary battery using the same method.
Use a second new battery cable, preferably black, and connect one end to the negative terminal of the first auxiliary battery using a suitably sized wrench. The negative terminal is labeled “-.” Connect the opposite end to the negative terminal on the second auxiliary battery using the same method.
Locate the two battery cables in the auxiliary battery compartment. The opposite ends are pre-connected to your RV so you only have to connect the cables to the auxiliary batteries. RV cables are generally white (positive) and black (negative), although the positive cable may be red.
Connect the white or red cable to the positive terminal of the first auxiliary battery using a wrench. Connect the black cable to the negative terminal of the first auxiliary battery.
Find the switch located inside the auxiliary battery compartment. Turn the switch to “Auxiliary” when you need to use your auxiliary batteries to power the equipment in your RV.
Items you will need
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