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Old 09-11-2022, 10:02 AM   #1
frydaddy
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2007 montana big sky 12 volt power

have no 12 volt anywhere my 110 are working the tv wall lights, ceiling fan but my question is does my 2 air conditioners dont run they dont run on 12 volt right??????? thinking i got more problems than 12 volt any ideas ??????
 
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Old 09-11-2022, 10:28 AM   #2
Carl n Susan
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I suspect the thermostat for the AC uses 12V. The AC is 120V but without the thermostat to tell it to turn on, it won't.
It sounds like you have no 12V power anywhere. Here is some info from a previous discussion of a similar problem.

=======================================
The 12V flow from the converter to the batteries is pretty straight forward. As others have pointed out, here are the places to look. All connections should have 13.5 +/- Volts if the converter is working.
  • The converter is part of the power distribution panel -Ensure the CB for it is On
  • There are Reverse Polarity Fuses on the converter which protect against connecting a battery backwards. - Ensure they are not blown.
  • Check the output voltage at the converter. - it should be in the 13.5V DC range.
  • The power then runs to the Disconnect Switch in the Convenience Center. - Ensure the Red Key is in the position where it can *NOT* be removed. If removed, this interrupts the power charging the battery. The Disconnect Switch is not know to fail, but you can remove it to check there is power in and out of it just to be sure.
  • The power next flows to the group of 50 amp self-resetting CBs behind the battery. We all know about the one that hiccups and interrupts the hydraulic system. That one also passes power to/from the converter and batteries. You want to check it and it's brother (it is in the current flow to the battery) to ensure there is 13.5V on *EACH* side of the CB.
  • The last connection is the one from the 50 amp CBs to the batteries. Ensure you have clean connections and the cables are not corroded (watch out for internal corrosion under the shrink wrap).
Somewhere along this path there will be the problem. A simple VOM should find it. I hope this helps.

The full blown discussion is *Here* The most common causes are :
o - the Battery Disconnect Switch in the convenience center is in the wrong position (the Red Key should be in the position where it can't be removed)
o - The red plastic covered self resetting 50 amp circuit breakers behind the battery have failed.
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Old 09-11-2022, 10:38 AM   #3
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could it be i lost 1 leg of my 50amp service ?
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Old 09-11-2022, 10:42 AM   #4
frydaddy
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didnt have any power where the converter plugs in either
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Old 09-11-2022, 12:15 PM   #5
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Quote:
Originally Posted by frydaddy View Post
could it be i lost 1 leg of my 50amp service ?
It's possible. Simple to check at your breaker panel with a volt ohm meter.
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Old 09-11-2022, 02:18 PM   #6
Carl n Susan
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The converter should provide 12V if it has 120V input. That is the only effect the loss of 120V has on the 12V side. It sounds like there is no power to it and it has been that way for a while. The batteries would be supplying 12V even if the converter is dead (until the battery becomes completely discharged).
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