2017 Jayco Jay Feather 23BHM – mysterious 4A battery drain every ~20 mins. Help!

Hey everyone, I’m chasing down a weird electrical issue on my 2017 Jayco Jay Feather 23BHM and could use some experienced eyes on it.

Setup & background: • Two brand-new Group 24 deep cycle lead-acid batteries • Installed a shunt (Bluetooth readout) to monitor usage • Added a battery disconnect to preserve charge while troubleshooting

The problem: A month or two ago I noticed my batteries were draining within a day or two when the camper wasn’t in use. First thought was bad batteries, so I replaced them. But even with new batteries, I’m still seeing the same drain — enough to run them dry if I don’t disconnect.

What I’ve found so far: • The shunt shows a 4 amp draw for ~6 minutes at a time • This happens roughly every 20 minutes like clockwork • Pulling the 30A fuse labeled “Slide Motor & Charge Line” stops the draw instantly • BUT… pulling that fuse also kills power to the rest of the 12V system (lights, radio, etc.), so it seems like a main circuit feed • Thought maybe it was the slide motor, so I replaced both the motor and the slide switch — no change • A while back when draining my water heater, I swear I could feel a mild electrical sensation in the water (which makes me wonder if I have a stray voltage / grounding issue)

Other notes: • The cycling behavior doesn’t match something like a CO detector or fridge light — it’s pulling a solid 4 amps for minutes at a time • Could it be water heater related? Converter? Some kind of parasitic draw from the charge line? • I’ve checked shore power and battery-only — same pattern • No blown fuses, no obvious heat or smells from wiring

Questions: • Could this be an open ground or stray voltage issue? • Is there a component on that “slide motor & charge line” circuit that would cycle like this? • What’s the best systematic way to trace this draw without losing my mind?

Any ideas or troubleshooting tips would be hugely appreciated. I’m trying to avoid just shotgunning parts at it.