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Old 09-28-2014, 09:43 AM   #1
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Water Pump or 12v problem

I have an Aquajet II water pump in my 2007 Monaco that may be failing. When using the pump with low demand the vanity lights will blink and almost go out. These are led lights. The other lights (not led) in the house may flicker, but only barely. When using the pump while showering (high demand) the problem doesn't seem to be as significant.

I know the pump uses 12v so I'm not sure if it is a 12v problem or a pump problem. I don't seem to have any other issues with the power other than on 2 occasions recently the 12v power tripped off. Was restored by using the 12v master switch.

These issues occurred while plugged into shore power. Water flow seems to be ok. Just wondering if the pump is increasing the load on the circuit causing the lights to dim or there is a problem with the 12v supply. Without a wiring diagram I am not sure what is on what circuit. Any ideas. Thanks in advance.

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Old 09-28-2014, 09:58 AM   #2
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First thing to do would be clean all connections at the coach batteries and clean the grounds to the frame.
Power draw from the pump is highest at start up, but if the draw is excessive , it should take out the pump fuse before any thing else.
If you have had problems with the coach 12v system shutting down completely; that required resetting the disconnect switch; then internal contacts in the disconnect relay are also suspect.

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Old 09-28-2014, 10:41 AM   #3
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Leds are very voltage sensitive, so they are probably reflecting a drop in voltage on that circuit. Maybe they share the pump power source? I would look for a bad/corroded connection. If you can't find the cause, consider running a new power wire right to the pump (with a fuse, of course). The pump hot wire is not switched - the switching relay is on the ground side, so running a new hot is simple. There is probably an inline fuse close to the pump already.
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Old 10-02-2014, 09:19 AM   #4
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Haven't found any ground problems yet. Did determine that the pump is using an Intellitec pump controller. Checked the connectors to the controller and they seemed to be ok. Lights still flicker but don't seem to be as bad. Still looking.
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Old 10-02-2014, 02:55 PM   #5
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While most 12v issues turn out to be bad grounds, my latest adventure was trying to find what was causing my jacks to blow a fuse, lights dimming and genset did not have enough amps to crank. After 4 new batteries and a gen starter and all grounds cleaned, it was a bad positive.

The disconnect solenoid is mounted behind the 12v distribution panel and one of the hot posts had a 7/6" nut that was not tight. Tightening it fixed all of my elec. issues. I was convinced a bad ground was the issue or bad contacts on a solenoid. That's why it took almost all Summer to figure it out.

Hope this gives you some ideas.

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Old 10-02-2014, 03:26 PM   #6
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Have you taken a voltage reading of house batteries when the pump is running? In addition, a bad ground is often the issue, check ground to the pump. If, as Gary suggests the ground is on the switch side, you'll have a harder time tracking down the grounding point.

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Old 10-02-2014, 04:03 PM   #7
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I would start by monitoring the DC voltage while the water pump is running. Seeing some detectable change is normal but it should be fairly small, like only a volt or two. If we assume that the pump is fused, then it shouldn't be the pump causing the problem but to be sure you may want to monitor the current to the pump.
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Old 10-02-2014, 05:29 PM   #8
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If you are absolutely positive there is no ground problem, consider having the coach batteries load tested. Worn out batteries, low on water, dirty connections, etc. can cause the problem you are having.
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Old 10-03-2014, 04:37 PM   #9
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Does it still have a problem when you're hooked up to shore power?
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Old 10-06-2014, 09:14 AM   #10
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Haven't found any bad grounds, tightened all the positive connections--no change. 12v seems to trip off without the pump running on occasions. Voltage didn't change when the pump is running. Don't believe it is a pump problem now. Load tested the batteries and they indicated about 50%. Replaced all 4 batteries yesterday so we'll see what happens now. BTW the problem occurs even when I am hooked to shore power.
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Old 10-09-2014, 11:48 AM   #11
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After replacing the batteries 4 days ago, have not had a repeat occurrence of the problem. Sure seems like the batteries were the problem. Thanks to all for the suggestions and comments.

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