Will Towed Vehicle Battery Go Dead While Flat Towing With Curt RVi Shadow 2 Braking System?

Updated 09/03/2025 | Published 08/07/2025

Question:

What happens if my towed battery gets low while I’m driving?

asked by: Terry

Expert Reply:

Hey Terry, no worries there. The Shadow 2 system # RVi94FR includes a built-in 10-amp Towed Battery Charger TBC that connects to your motorhomes 12V umbilical power. It actively charges your towed vehicle’s battery during travel and keeps it from draining while the system runs.

There’s even a status light on the Shadow box, flashing blue means your battery’s in good shape, yellow is caution, and red means you’re under 11 volts. If you’re curious about real-time status, the Bullseye monitor in your RV will display voltage and charging activity too.

Have you had any chargers or charge lines to keep the toad battery topped off in the past?

expert reply by: Andrew N

Terry

9/3/2025

That makes sense, Andrew. So basically I don’t need to run a separate charge line anymore?

Andrew N.

9/3/2025

@Terry Exactly, Terry - the Shadow 2’s built-in charger takes care of that for you. Just hook up through your umbilical and you’re covered. Have you already decided where you’ll mount the Shadow box in your toad?