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Topic: Looking for the location of the 12v water pump on my1998 U320 thanks (Read 1154 times) previous topic - next topic

Looking for the location of the 12v water pump on my1998 U320 thanks

I have a 1998 U320 and my 12v water pump will not turn off , the green light stays on at all three locations and when you push any one of the 3 locations it will not turn it off . So I was just wondering if someone could tell me the location of the pump please . Thanks

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #1 –
On a 99 U320 it is located next to the water manifold located in the right side bay just in front of the right rear duals. Not sure if the same on 98?
Chuck Wiggy
Coloma, Wisconsin
Sold my 1999 U 320 40 Ft. M11 450 hp
Build # 5468
2009 Silverado

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #2 –
Pump
Chuck Wiggy
Coloma, Wisconsin
Sold my 1999 U 320 40 Ft. M11 450 hp
Build # 5468
2009 Silverado

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #3 –
 On my 98 U320 it is in the bay described by Muskyman.  It is behind the Aqua hot cozy.

It is easier access if you take down the fiber board panels in the bay and remove the shelf over the pump.
1998 U320 40'
2005 GMC Yukon
MC# 17609

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #4 –
Quote from: Brianwhittington123 –
I have a 1998 U320 and my 12v water pump will not turn off , the green light stays on at all three locations and when you push any one of the 3 locations it will not turn it off . So I was just wondering if someone could tell me the location of the pump please . Thanks

Is the pump running all the time or are the lights just on?
The lights and the pump are powered through a latching relay (mine is behind the white fiberglass panel on the wall in the big bay).
Pushing any of the momentary switches closes a short connection to ground which latches or releases the relay.
You could have a stuck switch or a ground fault somewhere.

The latching relay wiring looks like this. (The fill valve here is your pump).  The #2 connection will remove power from the pump and lights.  The A2 connection is the grounding switch connection.

Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #5 –
Yes the pump kicks on and off every once and a while so yes it's on . I appreciate all the response I will look tomorrow and find it , also thanks for relay location as well . I've owned three of these coaches in the past and I totally disassembled one that generator caught fire . I converted it to a fifth wheel for 18 wheeler . I just recently pick up this 98 and having to remember this all over again , lol  Thanks Again

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #6 –
Brian, good to hear from you. You probably don't remember me, but when I was looking for my coach, I drove down from KC to look your coach before you turned it into a 5th wheel. It was a very nice coach. Welcome back and don't be a stranger.

Larry
Larry Warren
1996  U320 36' SBID "Lola" sold 2020
Build #4970
Motorcade #18318

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #7 –
Quote from: Brianwhittington123 –
Yes the pump kicks on and off every once and a while so yes it's on .

If the pump cycles on once in a while with no faucets open, you need to find the LEAK.  Particularly important if it is leaking in the wet bay, as that water finds its way directly to the rear bulkhead.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #8 –
Quote from: wolfe10 –
If the pump cycles on once in a while with no faucets open, you need to find the LEAK.  Particularly important if it is leaking in the wet bay, as that water finds its way directly to the rear bulkhead.

And if you don't find a leak, isolate the pump as they sometimes have the same symptom.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #9 –
Quote
V I converted it to a fifth wheel for 18 wheeler

I remember posts on that project a few years back. If you get a chance sometime, post some photos. It would be great to see it hooked up and the modifications you had to make. Thanks
jor
93 225
95 300
97 270
99 320

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #10 –
"If the pump cycles on once in a while with no faucets open, you need to find the LEAK."

Might the leak be an AIR leak? I have a pressure tank, which provides a bit of pressure without the pump. Last year I replaced it because it wasn't holding pressure. I believe that the pump pressurizes that tank, as well as providing the main pressure for the water lines. That pressure tank won't hold pressure indefinitely, so if you aren't using water and have the pump circuit energized, the pump will eventually come on to bring the pressure in the tank back up, won't it?

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #11 –
David,

Not sure I understand your point.

The ACCUMULATOR has a diaphragm in it.  As long as it is undamaged, it will maintain pressure forever. And, it is easy to test-- at least on the majority.  They have a schrader valve (like on a tire). Turn off shore water, turn off pump and open a faucet to depressurize.  Use a tire gauge to check PSI.  Any water comes out-- accumulator is bad.  Proper PSI is CUT-IN PSI less 2 PSI.  So, for many pumps 23 PSI.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #12 –
As craneman said it could be the pump, the check valve could be gone.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #13 –

Brian, I'm sure you have fixed this by now but....that is the switching relay causing that problem. One of the points has fused closed.
If you have the Finder relay unit they are easy to get, but the old automotive cube style relay is a little harder to find.
After many hours of searching though... this is the one that FT used on my 1998. I had the same problem, so figured if someone else is searching for the answer it would be useful.
SAR9200, originally made in Austria, then copied in Germany, now made by Standard Motor Products with a new number. LR35


Amazon.com: Standard Motor Products LR35 Relay : Automotive

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
1998 U295 36'
Build# 5358

SMILE!....it makes people wonder what you have been doing.

Re: Looking for the location of the 12v water pump on my1998 U320 thanks

Reply #14 –

This is what is used on later (2001) coaches
Finder 20.23.9.012.4000 1NC + 1NO 16A, 12V DC Coil, AgSnO2 Contact, 2 Step...

You can use this one with a built in timer to turn off the water pump after a user setable time.
GAEYAELE 1PCS GRT8-M 16A Multifunction Time Relay with 10 Function Choices...

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN