Openai/683df711-c7b8-8004-a270-9f6cc034c12c

This conversation was exported from ChatGPT

gpt-4o

User: We are on the road with our Thor scope 18M 2022.

We are on the road with our Thor scope 18M 2022. Lithium house batteries installed fall 2024, dc to dc and solar panel controller a few days ago. batteries almost completely discharged around 8:30 this morning after about 14 hours stopped (no shore power) with refrigerator, fan, phone charger and lights running. Tested system again around 11 am with vehicle stopped, engine turned off. Battery now seems to maintain charge but the rv’s power management system (BMPro) is disconnected and won’t turn back on. Not sure what the problem is, can anyone help?

Assistant: Thanks for the detailed info — and yes, I can help.

Thanks for the detailed info — and yes, I can help.

You're working with a 2022 Thor Scope 18M, built on the RAM ProMaster chassis, with lithium batteries (RELiON), a DC-DC charger, solar controller, and now a non-responsive BMPro power management system.

Let’s break it down precisely:

🔍 Top Reasons Your BMPro Panel Is Not Powering On

• Battery voltage dropped too low overnight, triggering system-wide brownout or BMPro protection shutdown
• BMPro system “soft-locked” due to voltage sag below startup threshold
• BMPro SmartConnect module fuse tripped or blown
• BMPro's internal logic locked after power drop and needs manual reset
• Loose battery terminals, inline fuses, or BMPro signal wiring disrupted
• 12V disconnect relay (controlled by BMPro) failed in the open position after low voltage
• DC-DC charger or solar controller misconfigured, sending erratic signals post-installation

⚠️ Safety Reminders

• Disconnect shore power and disable any automatic generator start functions before handling the BMPro or DC-DC wiring.
• Verify lithium batteries are fully recharged or externally boosted before attempting system resets.
• Use insulated tools when testing fuses or terminals to prevent shorting.

🧰 Required Tools and Items

• Multimeter (for 12V DC continuity and voltage checks)
• #2 Phillips screwdriver (for panel access)
• Inline fuse tester or spare 5/10A fuses
• BMPro system wiring diagram (from Thor Owner’s Manual)
• Access to lithium battery reset or power button

✅ Step-by-Step Fix and Diagnostics

1. Verify Battery Voltage - Use multimeter at the battery bank terminals (RELiON): confirm ≥12.8V. - If voltage <12V: charge externally via 120V charger or vehicle alternator until full.
2. Check BMPro Main Power Feed - Locate the BMPro “Node” or “Power Distribution Module” (usually near fuse box or behind main cabinet). - Test for 12V input to the unit with the multimeter. - If no 12V present: trace back to inline fuse or 12V cutoff relay — replace fuse or confirm relay is closed.
3. Check for Blown Fuse at BMPro System - There’s typically a dedicated fuse labeled “Control” or “BMPro” — verify continuity or replace with known good 10A fuse.
4. Reset the Lithium Batteries - For RELiON InSight batteries: - Locate the power button (often hidden on the end panel). - Hold for 3–5 seconds to initiate wake cycle. - LED indicator should turn green (if not, consult InSight manual for internal BMS fault).
5. BMPro Touchscreen or App Soft Reset - Hold the touchscreen power button (if equipped) for 10 seconds. - If using a remote key fob or app module (Node BLE), open/close the entry door 3x within 15 seconds to trigger wake command.
6. Pull Battery Disconnect for 5 Minutes - Open battery compartment. - Disconnect negative battery terminal (or use master disconnect if installed). - Wait 5 minutes — reconnect — check if BMPro initializes.
7. Manually Power the BMPro Panel - If accessible, apply 12V to the BMPro panel's input wire directly (bypassing fuse temporarily for test purposes). - If panel lights up: wiring/fuse issue confirmed.
8. Check DC-DC Charger and Solar Controller Wiring - Verify solar controller isn’t backfeeding erroneous voltage into system signal wires. - Disconnect temporarily if system appears unstable.

🔄 If All Else Fails

• Try a firmware reset via the BMPro Connect app (if supported).
• Locate the BMPro CAN connector and reseat it (unplug/replug).

Let me know your current battery voltage and if the BMPro panel shows any faint signs of life (flicker, backlight, etc.). Also, if your solar controller has any status LEDs showing fault codes, we can trace that too.

Ready to experience the latest in luxury travel? Call The RV Adventure Specialist at 305-304-1221 to trade in your RV or get into a brand-new model today!