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Low voltage fuse box melt down

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Jim Shunkwiler:
Joel do you think water in the battery compartment could've caused my problem?

Joel Ashley:
I wouldn't think water in your battery compartment to have caused this specific issue.  Is the green lamp still on at the bottom left of the Multiplex Control Master?  Or is it red for "Fault".

I'm no electrician but I'd consider pinching the sides of the 2 white connectors on the Multiplex Control Master and removing them.  I would expect this to turn off your switch backlights that are stuck on, and may protect anything in the Multiplex system yet in jeopardy.  Taking the cover off the black inset House Fuse Box and pulling the fuse to the Multiplex Control Master is also an option;  I think that is fuse number 9, Multiplex CPU.

Of course if you haven't already lost some or all of your 12 volt lighting from either or both A and B dimmer modules, this will disable them.  The fans may still be operative via their on-board switches, I'm not sure, but unfortunately the water pump likely won't come on if Module B is out of commission.

As Ed suggested, a call to BCS in Bend may glean experienced input regarding Multiplex and maybe insight into the overheated J2 connector with no blown fuses.

Be sure to print copies of the diagrams for your service tech.  When the cause is determined next week, please advise us.

Joel

Jim Shunkwiler:
My multiplex control is completely burned and melted. I could email you pictures but I've been unable to post them from my iPad. So the fact that my backlights are on and there is no control unit hooked up tell you anything.

Joel Ashley:
I thought the damage was just to the connector and board at module A.  The CPU master control (IPX on the diagram) is fried too?

The schematic and CPU box markings indicate the red/white stripe wire from the 3-wire white connector supplies power to the switch backlights.  Disconnecting it and/or yanking the CPU fuse should shut down the backlights.

Joel

Jim Shunkwiler:
The upper left  corner of the controller module A with a 2 wire connector was burned the most. It appears those two wires caused module A to melt then burn. It's just  module A that's toast.

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