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Old 10-24-2015, 01:54 PM   #1
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What Are They For?

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ID:	110301 Hello, all. I have a 2014 DRV Mobile Suites 39TKSB3 5th wheel trailer. Inside the electrical cabinet area are these 3 switches labeled for the tanks. Nothing in any of the literature I have mentions them. I'm guessing they might turn on the tank heaters that are on the plumbing system, but I don't know that for sure. Any thoughts? Thanks!
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Old 10-24-2015, 03:16 PM   #2
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Those ARE probably for the tank heaters.
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Old 10-24-2015, 04:39 PM   #3
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I have a 16 39TKSB3, I have only one switch down there and it's labeled "Tank Heaters"
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Old 10-24-2015, 04:42 PM   #4
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It is what it says . To heat the tanks.
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Old 10-25-2015, 12:13 PM   #5
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^^^ where did it say that?

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Old 10-25-2015, 12:43 PM   #6
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Just a little logic would indicate that if the unit has tank heaters, then there would be a switch for them, otherwise, they would be on in Phoenix in the summer. Wouldn't think it had to say "Heater" also, but sure would have been easy for the factory to put that little extra word there...
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Old 10-25-2015, 04:37 PM   #7
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I also only have one switch in that area. It is labeled as "tank heater."
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Old 10-25-2015, 05:31 PM   #8
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Do you have electric dump valves??????
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Old 10-26-2015, 08:09 PM   #9
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Do you have electric dump valves??????
No, I've got manual valves that pull from the outside water station. Eventually I'll trace the wiring to see where it goes, but it's so hard to get back in there where the breaker box is.
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Old 10-26-2015, 08:14 PM   #10
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Just a little logic would indicate that if the unit has tank heaters, then there would be a switch for them, otherwise, they would be on in Phoenix in the summer. Wouldn't think it had to say "Heater" also, but sure would have been easy for the factory to put that little extra word there...
I'd think the same thing, except that the book the previous owners left for me about the tank heaters says they automatically come on at 45*. It's just such a rat's nest of wiring in the back of the breaker box area that it'll make it hard to trace the lines, but I'll figure out something.
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Old 10-26-2015, 08:42 PM   #11
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Man I would not be able to sleep until I know what they do!!!!! That's the stuff that drives me crazy.
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Old 10-26-2015, 10:39 PM   #12
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My switches are the same as your picture. I ordered the heat pads on tanks with elbow heater option and that is what the switches located in the bottom cabinet are for. They do not come on automatically.
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Old 10-27-2015, 08:59 AM   #13
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My switches are the same as your picture. I ordered the heat pads on tanks with elbow heater option and that is what the switches located in the bottom cabinet are for. They do not come on automatically.
Thanks for the info. That makes perfect sense as to what they're for, but it's always nice to get confirmation from others. That's what I love about this forum; there's so many great RVers ready to share information with others.
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Old 10-28-2015, 05:09 PM   #14
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Maybe they come on at 45 degrees if the switch is turned on first.
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