7-way charge line compatible with DC-DC converter?

[chasc]

I’m not interested at this time in running a separate high gauge wire for charging and know this will limit max amperage. I was hoping to put a DC-DC charger in my trailer, inline with the charge wire from the 7-way plug, to boost the voltage for charging LiFePO4 batteries. I saw a couple posts on other Ford model forums that made me worry the circuitry in the Ranger tow controller may not enable charging unless it sees a trailer battery’s voltage first and thus may be incompatible with a DC-DC charger. Does anyone have experience in a ‘24 Ranger to know if this works?

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[stormrider151]

Based on the limited information. It would seem to achieve that an RV converter would be your best bet. Or maybe I'm completely off base. My SD charges my travel trailer through the house converter.

 

[chasc]

I do have a “converter” that charges the batteries when plugged into shore power. I’m interested getting some limited charging while driving and connected to the trailer plug. I’m hoping to understand what interlocks the truck has before it supplies power to the battery charge pin of the 7-way connector: Ignition on, door closed, voltage sensed, etc.

 

[stormrider151]

I'm not sure how it does it but when I'm plugged into the truck and driving the truck does charge the trailer battery. Some trucks are always hot at the pin and others are hot only when driving. The best way to know is test the pin when the truck is off and then on. I just use a test light on the pin but you can also use a multimeter. It is pin #4 on the truck side.

 

[Jason B]

I'm not sure how it does it but when I'm plugged into the truck and driving the truck does charge the trailer battery. Some trucks are always hot at the pin and others are hot only when driving. The best way to know is test the pin when the truck is off and then on. I just use a test light on the pin but you can also use a multimeter. It is pin #4 on the truck side.

That might work, but on some vehicles there is nothing at that connector UNTIL a trailer is hooked up.
I don't know if that's how it is on 6G, because in the excitement of buying a new truck, my greed resulted in getting one without the tow package.

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