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Old 11-29-2013, 02:53 PM   #1
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New water pump won't work

We were not able to get out of Alberta quick enough this year to avoid a good freeze which trashed my water pump. When we got down south I discovered it was leaking badly from the housing and completely had drained my fresh water tank. I replaced the pump with an identical 55aquajetARV but the new one is not working. I have reviewed all the threads on this website and rv.net forum and have tried most of the suggestions ie: 1. toggling between city and tank fill handle 2. power is going to the pump on the positive lead is at about 10 volts (why not 12 v?) 3. all fuses are intact 4. I don't know if city hookup will work because I am currently boondocking in California.

Photo is at:

Water Pump Photo by djbroughton | Photobucket

Any other ideas?
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Old 11-29-2013, 02:59 PM   #2
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What ground are you using to measure the "10v"? Maybe you ground to the motoer is bad or the connection is not a good one. Just a thought.
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Old 11-29-2013, 02:59 PM   #3
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check the water filter and make sure it is not loose, my last trailer the water wouldn't come out of the faucet and it was because air was getting in at the filter- one turn and water flowed. also check the fitting.
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Old 11-29-2013, 05:12 PM   #4
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What ground are you using to measure the "10v"? Maybe you ground to the motoer is bad or the connection is not a good one. Just a thought.
I'm not using a ground. I'm using my multi-meter to measure the charge when I remove the fuse in the positive wire and plug the leads into the fuse holder.
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Old 11-29-2013, 05:22 PM   #5
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I'm not using a ground. I'm using my multi-meter to measure the charge when I remove the fuse in the positive wire and plug the leads into the fuse holder.
To me, it sounds like you do not have a proper ground. Check all your connections and see that you have a good ground connection from the MH chassis to the pump. If it worked before, it should work again as long as all connections are tight and clean.
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Old 11-29-2013, 05:27 PM   #6
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To me, it sounds like you do not have a proper ground. Check all your connections and see that you have a good ground connection from the MH chassis to the pump. If it worked before, it should work again as long as all connections are tight and clean.
Looking at your photo, are you measuring the voltage across the Red & Black wires?
If you pull the plug apart and put your VOM across the Red & Black, you should see 12V. If so, carry on down toward the pump connections that you have twisted together to make sure it is the same and not a poor connection there.
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Old 11-29-2013, 05:37 PM   #7
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Did you try putting power to the pump prior to installing? I have a couple of sets of 10 ga jumpers made up with alligator clips, ring terminals etc. and an inline fuse to be able to go from the battery or a known good 12V source. When I went to winterize I found my 12V cutoff switch had failed. I was able to draw power from before the switch and power the pump to suck in antifreeze.
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Old 11-29-2013, 06:30 PM   #8
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To me, it sounds like you do not have a proper ground. Check all your connections and see that you have a good ground connection from the MH chassis to the pump. If it worked before, it should work again as long as all connections are tight and clean.
So I wired the pump directly into the 12 volt system, bypassing the normal plug. The pump worked great. Now I will have to start looking for that weak ground.
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