What did I short out??

[mdarling]

I replaced a 15 amp fuse without fuse without turning off power in my 2008 3400rl Montana. Not hot water heater won’t work and ceiling lights not working. Fuses and breakers good in box. Is there a fuse for the converter?

 

[Mikendebbie]

Welcome to the forum! Someone will be able to help you here.

Edit: I just tried searching the forum for 2008 FUSE PANEL and this thread came up from 2011. I will keep looking for better info.
https://www.montanaowners.com/forums/showthread.php?t=46448

Here is another thread that sounds similar to your issue…
https://www.montanaowners.com/forums/showthread.php?t=28222

..and another one…
https://www.montanaowners.com/forums/showthread.php?t=27196

 

[BB_TX]

For 2008 the ceiling fan is most likely 120 vac. My 2007 was 120 vac.

Your water heater probably works from electric and propane. Electric side works from 120 vac and propane side works from 12 vdc to operate gas valve. Inside you probably have only one switch for the water heater. If so, that switch is for propane operation. And if you only have one switch inside then you will have a black rocker switch outside on the water itself to operate from 120 vac. Does the water heater work on either electric or propane? Or neither?

 

[Carl n Susan]

I replaced a 15 amp fuse without fuse without turning off power in my 2008 3400rl Montana. Not hot water heater won’t work and ceiling lights not working. Fuses and breakers good in box. Is there a fuse for the converter?

I find this problem description difficult to understand. I *THINK* you replaced a 15 amp fuse and now the water heater and ceiling lights don't work?

• First, what 15 amp fuse did you replace and why?
• Was there a red LED indicating the fuse was blown? Did the red LED go out after the fuse was replaced.
• What mode are you trying to run the water Heater (WH)? Propane mode requires 12V; electric (120V) mode does not AFAIK.
• The ceiling lights don't work? All of them? How about the bedroom lights, the lights at the rear corners, and the lights under the rear cabinets? All those lights are 12V but are on separate circuits.

You can change a 12V fuse without turning off the power.

The converter does not have a fuse. It is a 120V AC device and has a Circuit Breaker (C that controls it. The battery should provide 12V (until it discharges too much) even if the converter is not working. Are there other 12V devices (water pump, outside lights, etc.) work?

If all 12V systems are INOP I would suspect both a dead converter and a dead battery. That seems unlikely all of a sudden. What is the voltage (measured with a VOM) at the battery and at the output of the converter?

Your answers to the above questions will enable us to further diagnose the problem.