Will Tekonsha Prodigy RF Stop Battery Backflow Between Tow Vehicle and Trailer
Updated 03/20/2025 | Published 03/09/2025
Question:
With LiFePO4 battery on the trailer charged voltage 14.6 v and a standard AGM battery on the tow vehicle charged voltage 12.6, does the Prodigy RF stop the tow vehicle from using the higher charged trailer house battery? Or will current flow back from the trailer house battery to run/charge the tow vehicle battery? Connections between a tow vehicle AGM and a trailer LiFePO4 typically need a DC-to-DC charger in line to stop this draining the trailer battery or at least a diode to stop flow.
asked by: Earl B
Expert Reply:
Hey Earl! The Tekonsha Prodigy RF # TK94FR allows everything to pass through so it will not stop any kind of backflow between the batteries. As you said, adding in a simple diode like the # RM-690 would be the best solution. If you need anything else feel free to reach out in the comments below.
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Earl B.
3/20/2025
I had thought of that part before but the part page only talks about the connection between a towing vehicle and a towed vehicle. It does not talk about applications for a towing vehicle and a travel trailer. That is, it only takes about light circuits and not about a 12v power circuit. The text even talks about "stopping any interaction between the two park light systems." Where this 12v power line (7-ping trailer wiring pin 4/black wire) wants a one-way interaction. I also assume that the arrows on the diode relate to the direction of energy flow. Do you have a suggestion on the best place to splice in the diode? Before the Prodigy RF/Open and inside the Prodigy RF/Between the Prodigy RF and the trailer 7-pin junction box/Inside the 7-pin junction box/After the 7-pin junction box and before the battery? Thank you