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Old 03-18-2020, 11:26 PM   #1
Junior Member
State: Alabama
Posts: 8
THOR #18392
2020 Thor Synergy 24SK

Has anyone tried to use their AGS with their Firefly Multiplex System with an On an Diesel Generator 3200 and got it to work. Not likely because it is only designed to work with an L P generator. The Onan diesel generators don't have a 12 volt signal letting the Firefly Multiplex System know they are running so the Firefly Multiplex shuts the generator off after 30 to 60 seconds. Thor needs to design a 120 volt AC marine grade converter or relay that will step down the 120 AC volts to 12 volts DC so we can feed it to pin 6 off the j13 connector so we can get generator status and hour meter. Who is in a similar boat????

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Old 03-22-2020, 12:33 PM   #2
Junior Member
State: Alabama
Posts: 8
THOR #18392
Thanks for the update on my Thor Synergy 24 SK with a Diesel Generator. Changing the Flirefly Multiplex Status Display RV to the different Thor Synergy Floorplan Configurations (24SS, 24 MB, 24TT ,...) with a Diesel Generator did not fix the problem. The results are the same no matter what floor layout you select.

If Pin 11 on the J10 connector on the G12 Firefly Multiplex Panel is responsible for starting and stopping the Diesel Generator only, then why is the Firefly Multiplex board reporting erroneous data for the Generator Hours which should be 31 hours and not “0” and why is the Firefly Multiplex board not showing a status of “Generator Running” on the display instead of “Generator Stopped”. Firefly has a way to test this scenario on their software in their lab so I would definitely ask them to run through this simulation to see if they get the same results.

I realize that the 12 Volt Blue wire (Pin 6 of the J13 Connector ) which is responsible for Generator Status and Hours is a LP Connector only but how does the Firefly Multiplex Board keep track of this hours and generator status with the Diesel Generator if there is no physical connection with only one red wire ( Pin 11 on the J10 connector) to turn the diesel generator on and off. If this is true, then the problem lies with Firefly and not Onan Diesel Generator or Thor Motorcoach Company.

We know as a result of La Mesa RV in Sanford Florida troubleshooting techniques (Technician Brett) that if we provide Pin 6 of the J13 Connector on the G12 Panel with a 12 Volt signal after the Diesel Generator turns on the System works as expected with the generator running beyond 60 seconds until the AGS condition is met (Temp or Battery Voltage or Max Run Time) and the Firefly Multiplex board shows a status of “Generator Running” on the display and the Hour Clock on the Firefly Multiplex Display appears to update properly.
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