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07-09-2020, 12:09 PM
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#1
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Junior Member
Join Date: Jul 2020
Posts: 2
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Does a water pump draw current when not in use?
I am figuring out how much current is being drawn by the different 12V system in my RV, I detected that when the water is on but not running, it draws a couple of amps.
My pump is a Shurflo 2088-422-144 which is problably original to my 2008 Sunseeker.
I would have thought that, when it is not pumping, it would not draw current or very little.
Is this normal or is the pump faulty?
When the tap is closed, it does not run as expected.
This is not an issue when connected to shoreline but when running off the coach battery, it becomes an issue when we leave the pump on as it drains the battery.
Any thoughts?
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07-09-2020, 12:16 PM
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#2
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Senior Member
Join Date: Jul 2018
Posts: 4,921
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Quote:
Originally Posted by EricR
I am figuring out how much current is being drawn by the different 12V system in my RV, I detected that when the water is on but not running, it draws a couple of amps.
My pump is a Shurflo 2088-422-144 which is problably original to my 2008 Sunseeker.
I would have thought that, when it is not pumping, it would not draw current or very little.
Is this normal or is the pump faulty?
When the tap is closed, it does not run as expected.
This is not an issue when connected to shoreline but when running off the coach battery, it becomes an issue when we leave the pump on as it drains the battery.
Any thoughts?
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A pump not running should draw 0 current. How did you determine the pump to be the culprit?
__________________
2005 Four Winds Majestic 23A
“To the world you may be one person; but to one person you may be the world.” - Dr Suess
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07-09-2020, 12:26 PM
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#3
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Senior Member
Join Date: Jun 2019
Posts: 690
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The pump shouldn't draw any current while off. Are you certain that there are no water leaks in the system causing it to pump at a slow rate?
The pump's indicator light would draw a low current. 2 amps seems excessive to me, though it may be possible in an older RV with incandescent lamps in the switches. If that's the case, trade it out with LED-lit switch that would draw a small fraction of an amp when on.
But thoroughly check for water leaks first.
__________________
'18 Rockwood 2109S '17 Silverado 2500HD WT. Hookups? What hookups? Mountains, please.
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07-09-2020, 01:09 PM
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#4
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Senior Member
Join Date: Jul 2000
Location: Chicago Metro
Posts: 3,963
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no current is drawn when the pump is idle. you will have an insignificant draw while the PUMP ON LED is lit.
don’t drive yourself crazy trying to get a precise number. there will be phantom draws that will drive you up a wall trying to find.
__________________
Rich, Ham Radio, Sport Pilot
Retired 9-1-1 Admin.
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07-09-2020, 01:39 PM
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#5
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,138
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I'm curious how you determined it was drawing current.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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07-09-2020, 03:36 PM
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#6
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Junior Member
Join Date: Jul 2020
Posts: 2
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Quote:
Originally Posted by Arch Hoagland
I'm curious how you determined it was drawing current.
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I used a ampMeter at the battery and made sure nothing else was running. When the switch is turned off, no current. With the switch on, a few amps. A more thorough test would be to connect the meter at the pump and remove all the fuses except for the pump circuit.
The water tank is close to empty. I'll check for a leak but I am not aware on any, at least nothing apparent and nothing dripping below the coach that I have noticed. Unless the leak goes into the waste tanks. I will empty the water tank just to make sure.
The switch is original (circa 2008). Probably incadenscent but even, that should not draw a few amps.
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07-09-2020, 04:10 PM
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#7
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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Lights in switch.
Latching controller.
Check inline at the pump.
A clamp.on meter is handy to have.
__________________
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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07-09-2020, 05:20 PM
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#8
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Senior Member
Join Date: Jul 2000
Location: Chicago Metro
Posts: 3,963
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Quote:
Originally Posted by EricR
I used a ampMeter at the battery and made sure nothing else was running. When the switch is turned off, no current. With the switch on, a few amps. A more thorough test would be to connect the meter at the pump and remove all the fuses except for the pump circuit...
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lp gas detector?
converter charger?
thermostat?
control panel?
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07-09-2020, 10:24 PM
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#9
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,138
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When the water pump does come on how much current does it draw then?
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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07-09-2020, 10:43 PM
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#10
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Senior Member
Join Date: May 2018
Location: Benson AZ
Posts: 512
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LP gas detector 75ma (0.075A)
Frig standby current 0.05A ???
Water heater standby current 0.05 ???
Jenson Stereo standby display current 0.05A
Converter reverse current drain 0.015A
Water pump on/off by it's pressure switch.
Best guesses and measurements for my rig. Frig control board is hardwired to 12v and monitors the off/on switch. So it has to keep alive somewhat.
__________________
Retired Engineering Technician, 2023 Artic Fox 25Y TT
SOLD 2017 Winne Minnie 2201DS TT
SOLD 2010 Chalet XL1930 A-Frame TT
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07-12-2020, 02:05 PM
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#11
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Junior Member
Join Date: Jul 2020
Posts: 2
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Did some more testing.
The water pump has a 10A inline fuse so I measured current at that point.
When it's not running, then no current as expected.
When running, it draws about 5A.
My fridge draws 0.7A for the control unit. My fridge only runs on 120V or gas but needs the 12V for the control unit.
So the conclusion to this is that a pump does not draw current when it's not running which is what should be expected.
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07-12-2020, 03:25 PM
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#12
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,138
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Thanks for the update.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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