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Charge my trailer battery while towing

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Hi all, this may have been covered but I could not find a quick answer using the search option.

I just got a 2017 Edge with the 4 pin flat light connector. While my trailer is small (1300 Trillium) I don't need a brake controller but would like to charge my trailer battery while driving. Is there a simple way using existing wiring or should I get a 7 pin connector and run a separate line from the battery?



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Thanks for the link but I seriously wonder that I need a $1300 adapter to charge my battery. My F150 does a fine job with the 7 pin connector and nothing else,

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