Posts: 5,776
Threads: 497
Joined: Jul 2012
Mine was vacuum plumbed wrong so I took a hand vacuum pump and used it to trace the functions of the control and the lines going g out if it to get them correct that rubber plug on t h e back can easily leak
Use an ohm meter to trace the unit and 12v like Richard said for the wires keep in mind you will likely have sone things that don't get used on the control panel
Tom
2002 45'8" Newell Coach 608 Series 60 DDEC4/Allison World 6 Speed HD4000MH
Posts: 46
Threads: 2
Joined: Jan 2017
I am in the process of sussing it out. I will publish the results when done.
I'm mystified as to the vacuum source. I assume there is a vacuum pump somewhere? Any ideas?
Tim
Posts: 5,537
Threads: 260
Joined: Jul 2012
Yep. Look under the coach in front of the driver tire. Ford vac pump made by hella and look for
A black round vac reservoir
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home

)
Posts: 2,718
Threads: 229
Joined: Jul 2012
On my '93 the vacuum was produced by a venturi device rather than a pump. So with the engine running up front under the coach you should hear a hissing sound from it.
Forest & Cindy Olivier
1987 log cabin
2011 Roadtrek C210P
PO 1999 Foretravel 36'
1998 Newell 45' #486
1993 Newell 39' #337
Posts: 4,195
Threads: 635
Joined: Jul 2012
These are lousy photos, not enough light but here is the face and the rear of my heater control. Not much help since there are so many wires the same color.
Michael Day
1992 Newell 43.5' #281
NewellOwner.com
Posts: 46
Threads: 2
Joined: Jan 2017
(01-20-2017, 12:59 PM)folivier Wrote: On my '93 the vacuum was produced by a venturi device rather than a pump. So with the engine running up front under the coach you should hear a hissing sound from it.
Vac pump or SNAKE?
Posts: 5,776
Threads: 497
Joined: Jul 2012
yea, mine started leaking on my 90 so i replaced it with a ford f350 vacuum pump
tom
2002 45'8" Newell Coach 608 Series 60 DDEC4/Allison World 6 Speed HD4000MH
Posts: 5,537
Threads: 260
Joined: Jul 2012
I don't know if this will help or hurt.
http://www.evanstempcon.com/guides_scs.php
In the past I have found a LOT of useful information on their site.
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home

)
Posts: 46
Threads: 2
Joined: Jan 2017
Posts: 22
Threads: 7
Joined: Apr 2014
Richard,
Thank you. I think that will help.
Dick Quirk