After changing cord from trailer to tv. I wanted to check and see if I hooked up the power wire correctly. Restin batteries were showing 13.1 on multimeter and with engine running on truck and plugged into truck they were showing 13.2. That seems low to me for charging while driving. Any thoughts or suggestions ?

Thanks

Rick

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2201 TL

2010 Nissan Titan king cab SE
4x4

That DOES seem low to be a charging voltage, but it looks like the batteries are fully charged (you said 13.1V resting) and in that case, the truck may not be applying ""absorption" or "bulk" charging voltage, but instead is applying "float" voltage, which is usually just a bit above 13.0V.

Were the batteries being charged on shore power before you connected your truck? A battery in the "resting" state after the surface charge has worn off usually reads 12.7V if it's fully charged.

- Jack

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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System, SoftStartRV mounted on A/C
2024 F150 Platinum FX4 3.5L PowerBoost SCrew

Yes. I had them removed and on a battery minder in the garage before reinstalling.

__________________
2201 TL

2010 Nissan Titan king cab SE
4x4

OK, I suspect you'd see higher voltage (14.0+) if the batteries were discharged a bit. I think you've installed your new trailer cord correctly.

- Jack

__________________
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System, SoftStartRV mounted on A/C
2024 F150 Platinum FX4 3.5L PowerBoost SCrew

Thanks, jack

__________________
2201 TL

2010 Nissan Titan king cab SE
4x4