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01-01-2018, 09:27 PM
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#1
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Site Team
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 1,914
M.O.C. #19755
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Tank Heaters
We were discussing this in a different thread. I checked the tank heaters and they are DC powered. I measured the current draw for each:
Black 7.3A
Gray 3.3A (seems odd since there are two gray tanks)
Fresh 3.9A
The heaters do not run through any of the DC fuses in the converter panel, nor either of the two fuses connected directly to my battery, so I have no idea where the heaters are fused.
I also wish mine had lighted switches like some others; I may change them out.
__________________
Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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01-01-2018, 09:50 PM
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#2
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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My 2017 3720 has the switches lighted. They must have changed partway thru the model year.
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01-02-2018, 08:52 PM
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#3
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Site Team
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 1,914
M.O.C. #19755
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I found that the tank heaters are connected to one of the breakers in the battery compartment. White wire with brown tracer.
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Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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01-02-2018, 09:44 PM
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#4
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,920
M.O.C. #20477
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Thanks Scott - good info. Surprising to me this is 12V. Will check mine to see if the switches are lighted - I have never used them.
Is Kodiac a Chocolate lab? We lost ours last summer at only 6 years.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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01-02-2018, 11:12 PM
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#5
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Site Team
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 1,914
M.O.C. #19755
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I have not used mine either, just wanted to know a little more about them. Of course, pulling the current that they do, you could not run them long without shore power; even if they are DC.
Yes Kodiak is a chocolate lab; 12 years old now. 
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Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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01-03-2018, 10:02 AM
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#6
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Montana Master
Join Date: Sep 2017
Location: Willis
Posts: 896
M.O.C. #20587
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Quote:
Originally Posted by scottz
We were discussing this in a different thread. I checked the tank heaters and they are DC powered. I measured the current draw for each:
Black 7.3A
Gray 3.3A (seems odd since there are two gray tanks)
Fresh 3.9A
The heaters do not run through any of the DC fuses in the converter panel, nor either of the two fuses connected directly to my battery, so I have no idea where the heaters are fused.
I also wish mine had lighted switches like some others; I may change them out.
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Agree that the white with brown is the wire to tank heaters off the breaker. Was finally answered by Tracy Peffley at Keystone confirming 12vdc. Mine pull floating amps but less than you are seeing. I'll try them again later individually. 100 watts seems a bit high for the black tank. They do seem to be thermostatically controlled. Mine switch off and on.
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2018 Montana 3791RD (SOLD)
2017 Ram 3500 DRW 6.7 Cummins Aisin, B&W RVK3600 (SOLD)
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01-03-2018, 10:25 AM
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#7
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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So far I've only used the black tank one. i'm trying to help the sewer bugs I put down there stay active.
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01-03-2018, 10:54 AM
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#8
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Site Team
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 1,914
M.O.C. #19755
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Quote:
Originally Posted by masterdrago
Mine switch off and on.
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I have not left mine on long enough to check that out; the unit is winterized with no liquids so I can't leave them on. I don't really plan on using these, but I like to know what is going on in the belly of the beast.
__________________
Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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01-04-2018, 05:16 PM
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#9
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Montana Master
Join Date: Sep 2017
Location: Florence
Posts: 945
M.O.C. #20472
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[QUOTE=scottz;1083665]We were discussing this in a different thread. I checked the tank heaters and they are DC powered. I measured the current draw for each:
Black 7.3A
Gray 3.3A (seems odd since there are two gray tanks)
Fresh 3.9A
The heaters do not run through any of the DC fuses in the converter panel, nor either of the two fuses connected directly to my battery, so I have no idea where the heaters are fused.
I also wish mine had lighted switches like some others; I may change them out.[/QUOTE
Our 17 3160RL has lite tank heater switches, must have been an option.
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2018 Ram 3500 MegaCab 4x4 Aisin, 4:10 Gears
Titan 50 Gal Tank, Air Lift Wireless Bags
2017 3160 RL
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