Electrical baffle

[Brian K]

Just pulled coach out of storage, have it hooked up to 110V, full lithium charge (verified), but I cannot get any of my overhead lights, fans or awning to work. The MiraCast shows that it is working, but nothing turns on. I can slide out the wall using the buttons in bedroom only. I assumed it was a fuse issue, but I don't see any fuses that are blown. Please, help! 2021 Dynamax Isata 3 24FW

[bikendan]

Moved thread from the Appliances and Electronics sub-forum to the Dynamax sub-forum for better support from other Dynamax owners and factory reps.

[bclemens]

Originally Posted by Brian K

Just pulled coach out of storage, have it hooked up to 110V, full lithium charge (verified), but I cannot get any of my overhead lights, fans or awning to work. The MiraCast shows that it is working, but nothing turns on. I can slide out the wall using the buttons in bedroom only. I assumed it was a fuse issue, but I don't see any fuses that are blown. Please, help! 2021 Dynamax Isata 3 24FW

I saw an issue at tampa when the batteries died. Power was restored, but the G12 (Main Firefly board) would not allow power to come through.

You just have to disconnect the constant hot memory wire.

The G12, should be in the kitchen cabinets. When looking in....left side, behind a access panel. I am pretty sure it is the RTC connection, J17.

Disconnect power, disconnect 12V....pull that wire. Then put the wire back on, turn all power back on. Voila!

[Sfmoldt]

I seem to have same or similar issue. 2022 Europa. Worked fine a month ago, then shut everything down in storage. Now G12 RTC has no power. I’ve rebooted several times, nothing. The firefly manual suggests no 12V or failure of G12. So my question here before I contact firefly again is there a fuse on that power feed? And where should I look? I traced the wire as far as I could from G12. Or is up front in the electrical bay? Somewhere I saw that it was a 50A fuse? Thanks.

[bclemens]

There is....but I would try "unplugging from shore power" first. I've never seen the RTC fuse blow...and I think it is 15, not 50.

The GoPower pass through relays are powered by 12V. So if you lose 12V power and plug in...it locks up the relays so power will not pass through.

1. Unplug from shore power
2. make sure you have 12V battery power. (disconnect is ON, showing green in the battery bay)
-if Yes, the you should be able to plug in, turn the inverter on at the inverter.
-if no, then use the battery boost to pair chassis and house, or fire up the engine to charge the house battery
3. Once you have 12V power, powering the inverter relays, plug back into shore, or turn on the generator.
4. Turn the inverter on at the button on the bottom of the inverter.
5. You should now have full control at the Firefly panel.

[Sfmoldt]

Brian, that seems to have done the trick. Follow up question, though. It seems my G12 goes offline when I switch power sources. My fix has been to disconnect 12v to house and then turn back on. Normal? Thanks for your help. Steve

[bclemens]

Not sure....you mean when you change from gen power to shore power, the G12 just cuts out? Neither should affect 12V, unless the battery is not healthy. What is the battery sitting at voltage wise? I assume stock 8D battery?

[Sfmoldt]

Yes, that has pretty consistently happened with this unit. Chassis is currently at 14.8v and house is 14.8v, and hooked up to 20A shore power. But when I switched from generator back to shore, G12 went offline, and I had to disconnect and reconnect to get G12 back up.Also had to manually turn on inverter to get to charge. I also have 400 w solar with grape solar. I’m not an electrician so I’m not quite sure how the solar interacts, but seems to keep things topped off, especially when in storage. I currently do not have ability to store with any shore power. And yes, stock Deka batteries, part no. 8A4D/T975.

[bclemens]

Chassis and house at 14.8 does not seem right. A full lead battery is 12.8, 12.9 volts. So you must be seeing a charge voltage from solar...not sure the charger would charge at 14.8. So you are not seeing the actual battery voltage. If you have a disconnect for the solar, I would turn that off...see where the batteries actually are.

From engineering" On the M2’s the (RTC) memory fuse is located in the fuse block in the front left compartment. If they turn the battery disconnect off, they kill power to the G12 and memory wire.

It seems that somehow, when power is transferring over, you are losing 12V power, which does not seem right.

[Sfmoldt]

The 14+volts was what Firefly was showing, which is also what solar panel was showing. I disconnected batteries and measured direct voltmeter readings of 12.8 and 12.9 on chassis and house, so I understand what you are saying. I don't think it is a battery problem. It seems to be a lack of automatic switching between shore, Generator and battery. I can get each to work, but I need to manually turn on inverter after the switch. I probably just need a better understanding as to how each system in integrated. Thanks

[bclemens]

There has to be a 12V fuse that is out or something. The only thing that gets transferred is 110V power. 12V power should be constant...on lithium, some batteries will do this to protect themselves if they see a surge (like power transfer), but AGM's are not that smart.