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11-02-2020, 06:47 AM
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#1
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Junior Member
Join Date: Feb 2020
Location: Sioux Falls
Posts: 10
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3730 Tank Heaters
Help I have 3 tank heater switches in my control panel none ars marked. I have 2 gray water tanks 1 black water tank and a fresh water tank. Anyone know witch 3 tanks the heaters are for. Thanks
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11-02-2020, 07:17 AM
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#2
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,685
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I believe you will have 1 for black, 1 for fresh and 1 for the 2 grey tanks.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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11-02-2020, 07:38 AM
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#3
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Senior Member
Join Date: Mar 2014
Location: Mountain Home, Idaho
Posts: 3,012
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At least the tank heaters all have separate built in thermostats. Also with a lot of patience you could use this DC wire color code chart to actually trace the heater wires to each tank
But.. it looks like they use the same color for the wires for each tank heater so it would be a tad more challenging.
https://www.keystonerv.com/media/915...w-wire-doc.pdf
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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11-02-2020, 07:56 AM
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#4
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,995
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Just a comment (my opinion, for what it's worth):
The way Keystone plumbs holding tanks, both gray tanks are going to have water in them as will the black tank. So, I'd suspect that if you're using the trailer plumbing, you will have some liquid in all the tanks, nearly all the time.
The reason for the above comment: If you've got "some liquid in all the tanks" you're going to have all the tank heaters on (if it's going to be that cold) so other than for curiosity sake, what difference does it make which switch turns on which tank heater? Other than troubleshooting problems, you're going to operate them "like they were all tied together" anyway.... At least that's the way I'd operate them.... YMMV
To add "Keystone's varied wiring plans" to the mix, I'd NEVER suspect that any trailer is "wired like the rest in that series" even if they came down the line "one after another and had sequential VIN's"....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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11-02-2020, 08:36 AM
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#5
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Senior Member
Join Date: Nov 2017
Location: Picacho, Az
Posts: 6,809
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Quote:
Originally Posted by JRTJH
Just a comment (my opinion, for what it's worth):
The way Keystone plumbs holding tanks, both gray tanks are going to have water in them as will the black tank. So, I'd suspect that if you're using the trailer plumbing, you will have some liquid in all the tanks, nearly all the time.
The reason for the above comment: If you've got "some liquid in all the tanks" you're going to have all the tank heaters on (if it's going to be that cold) so other than for curiosity sake, what difference does it make which switch turns on which tank heater? Other than troubleshooting problems, you're going to operate them "like they were all tied together" anyway.... At least that's the way I'd operate them.... YMMV
To add "Keystone's varied wiring plans" to the mix, I'd NEVER suspect that any trailer is "wired like the rest in that series" even if they came down the line "one after another and had sequential VIN's"....
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Not to mention that because you have switches doesn't necessarily quarntee you have tank heaters.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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11-02-2020, 09:16 AM
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#6
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Senior Member
Join Date: Mar 2014
Location: Mountain Home, Idaho
Posts: 3,012
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Quote:
Originally Posted by travelin texans
Not to mention that because you have switches doesn't necessarily quarntee you have tank heaters.
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That is a really great point... the switches on many panels are universal and don't necessarily mean the function is installed....
The only way the OP will kow for sure is request from Keystone a build sheet spec by his VIN# or start dropping colorplast to verify with eyes what is actually installed
__________________
2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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11-02-2020, 09:29 AM
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#7
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Senior Member
Join Date: Oct 2018
Location: Sacramento
Posts: 1,005
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The build sheet for my trailed didn't contain any information regarding the tank heaters. I verified mine were "doing something" by watching the DC amperage load on the battery as I turned on each switch.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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