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Should The 12v Accessory Pin On A Trailer 7-Way Plug Always Be Hot  

Question:

I have a 2023 Forest River Grey Wolf 22CEBL with 12v refrigerator, solar, and two batteries. When its not connected to the tow vehicle, should the Aux 12v-charging pin be hot all the time on the trailer wiring? Thank you!

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Expert Reply:

If the 12v pin is connected to your trailer batteries and there isn't anything in place to prevent power from back feeding then the pin will remain live. If you install a diode # RM-690 in between the trailer battery and 7-way 12v pin it won't be able to back feed past the diode.

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Kevin C

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