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HWH air compressor

The HWH air compressor will not turn on in my 1997 U295.  All voltages are correct from the 15 amp 12 vdc battery power and also the relay on the buss bar is reading 12 vdc on both sides.  I am not getting 12 vdc from the 12 vdc signal wire which connects to the pressure switch on the compressor.  I took a jumper wire and applied 12 vdc power to the signal wire and the compressor came on.  Is there a in-line fuse for the signal wire that I am not finding?  Any help would be great.
Terry
Terry and Cheryl Brown
1997 U295 36'
Build #5066
2006 Jeep TJ Rubicon
1993 BMW R100 GSPD

Re: HWH air compressor

Reply #1 –
We had the same problem.  If your unit is like ours, the 12v comes from the HWH control box (aluminum box on the ceiling of our center compartment in our 99 U270).  I debugged it and concluded that the relay in the HWH box was either bad or the driver circuit was bad.  I cut that wire and installed a switch near the compressor to connect directly to 12V through a fuse.  That allows us to turn it on and off when we want.  The pressure switch on the compressor turns the pump off when it's up to pressure, so the only reason to turn it off is when we are boondocking and don't want the 12V draw or possibly for noise reduction.  Our pump has a slow leak somewhere (yep, it's on the list...) and will cycle on and off about every hour or so, but the bags/air solenoids hold air for a week or more.
Dave and Nancy
1999/2013 U270 36' Xtreme
Motorcade # 16774
2013 Subaru Outback
KD0NIM

Re: HWH air compressor

Reply #2 –
I re-seated all the connectors on the control module and now everything works as advertised.  The air compressor turns on when the up button is pressed.  Now for the next project-installing a CD player in the dash.
Terry
Terry and Cheryl Brown
1997 U295 36'
Build #5066
2006 Jeep TJ Rubicon
1993 BMW R100 GSPD

Re: HWH air compressor

Reply #3 –
Quote from: CAPEHORN31 –
I re-seated all the connectors on the control module and now everything works as advertised.  The air compressor turns on when the up button is pressed.  Now for the next project-installing a CD player in the dash.
Terry
That's good news on the HWH system. :)

DON'T cut any holes in the metal instrument panels. It has electroluminescent lighting. My understanding is that any drilling or cutting will likely destroy the dash lighting. You will likely be able to use existing holes.

Our coach has a Sony radio/cd/cassette player in it. Yours is probably similar, and you may be able to replace the existing unit with a player of your choice.
J D Stevens
1997 U295 CAI 36' Build #5085
2002 Subaru Outback
Motorcade 16869
Bellville, TX

Re: HWH air compressor

Reply #4 –
Is there a reserve air tank for the 12V air compressor or does it feed directly to the leveling system and slide bladders?
'02 U295 36'
Build #5937

 SKP#104358
Motorcade#17428

Re: HWH air compressor

Reply #5 –
on our 98 the compressor fed directly to the level system, but on our 03 the compressor feeds a reserve tank, so depends on what system you have.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: HWH air compressor

Reply #6 –
tom our 2001 has a tank.  under front end of coach, three tanks.  one is for the HWH bladder/level as I understand it.  You read that a 03 has a tank, now a 01 so I would guess an 02 does as well
Mike
2001 U320 4010 Build 5878 (Gus)
Wrangle Unlimited Toad
Nacogdoches

Re: HWH air compressor

Reply #7 –
Thanks, I'll look today now that you have narrowed it done for me.
'02 U295 36'
Build #5937

 SKP#104358
Motorcade#17428

Re: HWH air compressor

Reply #8 –
My 02 has a tank in front for the HWH.  I am installing a switch for the aux compressor so I will not have to pull the fuse when placing in storage.. DAN 
Dan & Shirley Stansel
2002 U295 4020 AGDS Build#6054
Towing Buick Enclave & M &  G Braking
Emerald Bay, Lake Palestine, Texas
MC# 16650