i'm assuming you are asking just for general info rather than because you are having a problem.
your trailer will have a converter installed in it. the converter may be a stand alone unit, built into the power distribution center, or an integrated converter / inverter combination depending on your specific make / model of trailer. the purpose of the converter is to take 120 volts ac power and convert it to 12 volt dc power to run 12 volt devices and to recharge your batteries. so yes the batteries should recharge when hooked up to shore power, or to a generator that the shore power cord is plugged into. there are a couple of issues that arise at times to prevent the batteries from being recharged. one is that the battery disconnect switch (if you have one) must be set to have the batteries online so they can accept the recharge from the converter. the other is that there is a small circuit breaker near the batteries that may trip and prevent them from being recharged. to verify that they are being recharged from shore power get a cheap multimeter and take a dc voltage reading at the battery terminals. it should be around 13.2 volts or higher. if you get this the batteries are being recharged.
as far as recharging from the 7-pin cable while towing that is a much lower charge level. don't expect to recharge depleted batteries using the 7-pin cable while towing for a day. also, different makes of two vehicles are configured with this charge line either enabled or disabled. some re
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2015 cardinal model 3825fl
2015 dodge ram 3500 dually
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