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Old 03-29-2020, 06:26 PM   #1
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98 Mallard water pump problems

After living in my Mallard a couple months I decided to look into my water system. I doesnt work. Fuse is not blown. One thing that is different than others is when I turn the pump on the switch does not light up. Any suggestions.
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Old 03-29-2020, 06:51 PM   #2
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The pump is 12vdc, id check to see if you have 12v at the pump wires with the switch on. If theres 12v to pump and not running then theres an issue with the pump. Id guess either a loose wire, bad pressure switch ( also on the pump assembly) bad pump or corrosion on the connections. If no 12v you have either a power wiring or on off switch issue. Id also check for 12v on both sides of the fuse with a test light to know its passing power.
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Old 03-30-2020, 03:28 AM   #3
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If you have more than one Pump Switch, you most likely have a CONTROLLER. 12 VDC is connected to this controller and so are the other pump switches plus the water pump (called LOAD). The controller is a small black box with wires connected to it usually mounted near the pump. When any of these switches is turned on (grounded) the 12 vdc is applied to the output of the controller and over to the pump.


Look to see if you have this controller by following the pump wires. The fuse in my case is also near the pump.



See link for typical controller and diagram.

https://pdxrvwholesale.com/products/...g-00-00145-100
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