I just posted on another thread.
Make sure the tanks are very tightly clamped down. I always thought mine were, but the technician at JC got to where I had mine by turning the hold down clamp and then went one full turn more and the monitors worked.
The tanks themselves are the ground for the monitoring system. Give it a shot, if it does not work, my guess would be you've got a short in the Firefly monitoring part of the system, which we also had and it was on our 2017 Classic.
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2020 28' Twin Flying Cloud
2021 F350 6.7 King Ranch
USAF Master Training Instructor (TI) & (MTI)- 68-72
Volunteer K9 Rehabilitator & Trainer
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