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Old 05-07-2020, 09:28 PM   #1
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Water pump wiring

Iím thinking about adding a 3rd switch to turn on/off my water pump from the bathroom. I have one switch on the main control panel, then another one inside the compartment of my outdoor shower. When one switch throws on the water pump you can go to the other switch and shut it off. In my mind this is like a
ď3 way switchĒ in your home where you have a light in the middle of a hallway with a switch at each end of the hallway. So how does a 3 way switch for a water pump get wired? Or a 4 way like I intend to do?
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Old 05-07-2020, 10:43 PM   #2
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Most use a latching relay. If yours does it should be an easy addition.
https://www.intellitec.com/wp-conten...-00145-100.pdf
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Old 05-08-2020, 08:11 AM   #3
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Quote:
Originally Posted by falconman View Post
Most use a latching relay. If yours does it should be an easy addition.
https://www.intellitec.com/wp-conten...-00145-100.pdf

X2
I actually have 4 switches, but surprisingly not one in the 1/2 bath.
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Old 05-08-2020, 11:08 AM   #4
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JohnyÖ..If the two switches you have now, are momentary, where you push them and they spring back, your RV most likely has a latching controller, linked above.

A latching controller uses ground (-) to turn on and off. When you push that momentary switch, it momentarily connects to ground. That turns on the latching controller. When you push it again, it connects to ground and shuts off the controller. Theoretically, you could add a 100 switches to the system.

Typically, when you turn something on and off, such as a water pump, the switch is used to break the connection to the positive side. With the latching controller, the positive side of your water pump is always connected to positive and the latching controller breaks the connection of the ground wire to turn it on and off.

To find your latching controller, if you have one, look near the water pump and follow the ground lead, it's usually a short distance between the pump and controller.

If a latching controller ever goes bad, which they do, you can jump a ground wire directly to the water pump and be back in service until you replace the controller. You just won't be able to turn the pump on and off...just disconnect the jumper wire when travelling.
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Old 05-09-2020, 06:18 AM   #5
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Quote:
Originally Posted by falconman View Post
Most use a latching relay. If yours does it should be an easy addition.
https://www.intellitec.com/wp-conten...-00145-100.pdf
Thanks, My water pump is behind an access panel in my large compartment. Iíll have to take a look see. One might already be installed. If not, Iíll have to buy it!
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Old 05-09-2020, 06:28 AM   #6
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Quote:
Originally Posted by Dutch Star Don View Post
JohnyÖ..If the two switches you have now, are momentary, where you push them and they spring back, your RV most likely has a latching controller, linked above.

A latching controller uses ground (-) to turn on and off. When you push that momentary switch, it momentarily connects to ground. That turns on the latching controller. When you push it again, it connects to ground and shuts off the controller. Theoretically, you could add a 100 switches to the system.

Typically, when you turn something on and off, such as a water pump, the switch is used to break the connection to the positive side. With the latching controller, the positive side of your water pump is always connected to positive and the latching controller breaks the connection of the ground wire to turn it on and off.

To find your latching controller, if you have one, look near the water pump and follow the ground lead, it's usually a short distance between the pump and controller.

If a latching controller ever goes bad, which they do, you can jump a ground wire directly to the water pump and be back in service until you replace the controller. You just won't be able to turn the pump on and off...just disconnect the jumper wire when travelling.

Thanks Don! After reading your detailed post I now understand. Makes total sense, especially after reading the link to the relay. I do not have momentary switches, they both are rockers. So I have to do a little rewiring, hopefully it can all be done at the pump side. This is my 3rd rig. After reading about floods while driving with the pump on, Iíd like to avoid that one! But I have a few months left on my coach warranty so this gives me time to figure it out before I mess with it. I donít ever want an issue that the dealer would try and push back on me because I made alterations to a factory installation.

Thanks everyone for your help!
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Old 05-09-2020, 11:07 AM   #7
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It's not at all like a 3-way switch. It uses a motor control relay that latches or unlatches in response to a change in position at any switch. The switches are momentary and are connected to the controller, not the pump. The controller actually switches the ground side of the pump.
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Old 05-10-2020, 06:44 AM   #8
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It's not at all like a 3-way switch. It uses a motor control relay that latches or unlatches in response to a change in position at any switch. The switches are momentary and are connected to the controller, not the pump. The controller actually switches the ground side of the pump.
Thanks Gary. Don mentioned that in his last post. But my 2 switches are not momentary, the are rocker switches. Unless Iím wrong, momentary switches spring back when you push them, like a door bell. Mine click in one position like a light switch.

John
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Old 05-10-2020, 08:36 AM   #9
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just want to see where this one goes
I thought I understood the latching switch but mine are not momentary as well

Just checked again and the switch fooled me It is a momentary switch it just lights the switch when the pump is powered,
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Old 05-10-2020, 09:27 AM   #10
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How many wires on the switch? If they are not momentary they are probably a three-way and wonít work with a latching relay. Any additional switches would need to be a four-way. Be careful if rewiring as existing switches might not have a ground wire available unless they are lighted.
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Old 05-10-2020, 01:44 PM   #11
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Since you only have two switches now, they could possibly be wired like a 3-way at home. Doing that with 3 switches in a 12v system isn't simple. falconman covered it, so I won't bother.


I'd change to a controller and new switches, but much depends on where the switches are and how easy it is to run the necessary wires for a 4-way.


If you have 3-way wiring, the two existing switches will be single pole, double throw types with 3 wires each.
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