I happened onto this website and I thought it would be good to share it with you. Many of us have dual batteries on our HiLo trailers that are wired in parallel to provide higher capacity 12 volt power. But do we have them wired correctly? As you will see, it does make a difference.

SmartGauge Electronics - Interconnecting multiple batteries to form one larger bank

As the article states, two battery hookups are not as critical as it is with more batteries.

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Great Wife, Joyce
2010 2310H Hi-Lo
2012 F150 4X4 SuperCrew EcoBoost w/Leer Cap
Reese WD Strait-Line Hitch
Amateur Radio K3EXU

Good to know thanks for any RV or boat application.

When you add the second battery and have connected positive to positive, and negative to negative, you should connect the trailer wires to the positive of the first battery and the negative of the second battery. That gives the most equal flow of current through the batteries and to the trailer. The link article didn't have the illustrations broken down to show two batteries.

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Great Wife, Joyce
2010 2310H Hi-Lo
2012 F150 4X4 SuperCrew EcoBoost w/Leer Cap
Reese WD Strait-Line Hitch
Amateur Radio K3EXU

Good find, Rich. I DO have my batteries wired so the positive feed (and charge) is from one and the negative feed/charge is from the other. I doubt the cable resistance is TOO significant in most cases, but still, whenever there is a heavy Amp draw, it DOES matter.

- Jack

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Hi-Lo 1707T
2005 F150 4x4 KR SCrew