[cknuth]

Hi Folks,
By unwelcome coincidence, I seem to be having something similar this weekend.
Brief background: Last week, I spent a bit of time prepping the coach to travel. Attempted to revive the old golf cart coach batteries - despite watering, correcting some inverter settings and several cycles of equalization, the house bank still settles at down to just above 11V - planning an ambitious replacement program sometime soon. On shore power or while driving, the inverter is trying to charge the house batteries, so the fridge and other inverted loads continue to function - just not on the house batteries alone. I also removed and cleaned up the engine batteries (with disconnect switch off,) checked their water, reassembled, restored the switch.

At startup for travel, the Silverleaf and analog gauges agreed on about 13.7V. Great drive from Phoenix to Bryce Canyon. Ten miles from destination, the Silverleaf alarm called out low engine battery voltage. It dropped to 11.9-12.1V in cruise. Alarm threshold was set to 12.5V. All other parameters normal. At the same time, the house inverter was still powering the fridge with no problem. We continued to the RV park and went on 50A shore power. All house power systems normal.

So it seems that the engine alternator is working but that engine battery is not charging. I had not used the merge switch. The Heart Interface Echo is seeing (disconnected from shore power after an overnight) 12.6V engine and 11.8V house.

Now back on shore power with the merge switch on, I'm seeing 14.5v absorb charging to the house and 14V at the engine battery.

Any suggestions on where to start troubleshooting?

Thanks,
Chuck