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Old 01-22-2016, 04:51 PM   #1
Join Date: Nov 2014
Posts: 69
Montana Power Question

Good day Montana Owners - My neighbor here in Yuma has a 2014 40 foot Montana 5ther. He had a strange electrical problem. Being an Electronics Engineer, I told him that I would take a look at it.
When connected to shore power, all 12 volt systems worked OK. However, when not connected to shore power, no 12 volt systems would work.

1. Battery is 1 month old - checked with VOM showing 12.5 volt OK
2. Checked "Salesman Switch" for power continuity through it - OK

Problem was resolved when I checked the four reverse battery fuses and installing them again. The "wiping action" of removing and then re-installing them must have provided the electrical path needed.

Now My Question:
In the power panel, along with the panel fuses, I noticed a switching power supply next to them (has two muffin fan to heat).
Q1: Is this the AC/DC inverter?
Q2: Does this provide the charging for the battery?
Q3: If this is part of the battery charging circuit, is it a standard battery charger or a 3 Level battery charger?

Best Regards & Thanks
Mark S
2010 Newmar Dutch Aire 4317, Tag Axle, ISL 425HP, 2014 Chevy Captiva

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Old 01-22-2016, 09:17 PM   #2
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Join Date: Aug 2004
Location: Burleson, TX
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Need brand and model number of the power supply you are asking about. Could be the converter; could be the inverter; could be combo both. If a converter, it provides 12volt power to charge the battery(s). If he has a residential fridge, it may be an inverter.
Can't know what type of anything it is without brand/model number--sorry.

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Old 01-27-2016, 02:25 AM   #3
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Join Date: Jan 2014
Location: Houston TX
Posts: 103
I had this happen on my older model 2 different ways.
In relation my model is older, so you may have to think your problem into newer tech.
On my battery storage box I have a red 12 volt breaker. That had tripped once in transport when the battery became loose. Pushed it in and 12 volt was on. It was hard to see at first. Every RV model I have had uses this . Battery will show power but it cannot reach the system.
The other is to disconnect the power cord to the RV 100% and not just turn the switch off. Mine uses a relay that disconnects or switches over to my Generator. So that both shore power and gen. power cannot combine. The cord in my case was plugged in and a bad breaker at a park, I am assuming.. Had some power still transferring on 1 line and held the safety switch open. Not allowing the 12v. shore and or gen set to work.
And like (wingnut) said. If you are using a 12 to 110 invertor and you run a object like space heater or non rv fridge then it may trip the breaker or invertor .
I hope my few past mistakes help. I have made more than a few to learn from.
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