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Old 10-27-2018, 09:13 AM   #1
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Lights dim when water pump runs

We have a brand new Creekside 21RD. It's our first TT. When the water pump runs, the lights flicker. In fact, for a split second they seem to go out. I have 2 6V gel batteries and 2 big solar panels. My batteries are pretty much always fully charged. It doesn't seem normal for the lights to flicker and it didn't do this before. We've only owned our TT for a month. Any suggestions before I call the dealer? Thanks!
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Old 10-27-2018, 09:19 AM   #2
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Didn't flicker before.

Before what?
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Old 10-27-2018, 09:42 AM   #3
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Before yesterday.
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Old 10-27-2018, 09:44 AM   #4
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Is it possible it's because the fresh water tank is low? Water is coming thru fine, but I'm below the 1/3 level according to the gauge by the door.
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Old 10-27-2018, 09:47 AM   #5
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Check battery cables....POS & NEG tight connections on battery posts....PLUS Ground connection
Check battery POS cable going inside....connections on 'in-line fuse/DC circuit breaker

Check Battery cable connections inside on the DC Dist Panel


And HOW are you verifying batteries are charged?
Actual voltage or via 'idiot light' monitor?
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Old 10-27-2018, 01:00 PM   #6
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I have the idoot light and a solar controller over the bed. Both indicate full. When the water pump isn't on, everything is great. When it comes on, everything dims. Even the fans slow down a ton.
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Old 10-27-2018, 01:33 PM   #7
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The pump is a pretty big draw. Mine does the same and I also have 2 6 volts. Even when hooked to shore power I get some flickering as the pump rapidly turns on and off.
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Old 10-27-2018, 02:00 PM   #8
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In addition to being a large current draw, motors are also an inductive load and will have a huge current draw when first turned on. Every trailer I have owned has had some amount of dimming when the water pump, furnace fan, or even the range hood fan are running. The water pump may be more noticeable because it usually runs in short spurts.
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Old 10-27-2018, 02:11 PM   #9
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I never had a water pump dim lights. Low or empty tank is not the problem. You have a loose/dirty connection between your loads and your source (the batteries). Check the cable connections, both ends, especially the negative (Ground) cable connection to the frame.
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Old 10-27-2018, 04:49 PM   #10
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The Shurflo 2088 pump in our trailer draws 3.5 amps. The lights have never dimmed when the pump was running. Whats the amperage on the pump you have?
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Old 10-27-2018, 05:58 PM   #11
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Have your dealer check the amp draw on the water pump. 3 1/2 amps is not that large of a load. Even when we activate the main slide with the lights on, there is no dimming. The slide draws 9 amps when starting, tapers off to 3.

Water pumps should not cause the lights to dim at all. Maybe something causing the pump to work too hard (deposits, something stuck in the rubber vanes).
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Old 10-27-2018, 07:29 PM   #12
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I think it's a ground connection somewhere. Look for the obvious first, like the battery ground.



I'm wondering if the ground wires are all properly connected in the cabinet behind the WFCO? Maybe there's a poor ground connection in there.


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Old 10-27-2018, 09:52 PM   #13
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Check the connections---we've never had a pump cause light flickering.
I pulled the WFCO out and one connector was a little loose. Upon checking other 12 volt connections, two just came apart, and another was loose.
Electrical connectors in ORV's seem to be slightly haphazard.
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Old 10-27-2018, 11:04 PM   #14
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How's this: i had a metal cable lock around the battery box. When I took that off, the problem stopped.
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