Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 01-15-2013, 09:23 PM   #1
Junior Member
Join Date: Jan 2013
Posts: 2
7.5 Gen Set faulty temp sensor

7.5 Gen set in my 2005 Itasca, Meridian is shuting down after about a minute of run time. Glo plug won't come on either. Fault code of 1 and 33 which is "overheating". This is not the case, doesn't run long enough to get hot. Problem is faulty temp. sensor. I have read about the extreme difficulties in getting to this sensor. Can anyone direct me to the end of the white wire that comes from the sensor? is it accessable so that it can be disconnected. I know this is just a temporary fix.


dkreb is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-15-2013, 10:02 PM   #2
Senior Member
Dave Fernandez's Avatar
Alpine Owners Club
Join Date: Jun 2003
Location: Ontario, CA USA
Posts: 1,304
Hello & Welcome to IRV2.

Sorry to hear about your problem with your Genset. The problem is the water temperature sensor. Contact Onan with the model &Serial Number for the water temperature sensor replacement part or you can take it to an Onan service center for repair.

Dave Fernandez
2001, 38ft FDDS, 350 ISC, Tow 2004 Yukon
Dave Fernandez is offline   Reply With Quote
Old 01-16-2013, 08:56 AM   #3
Senior Member
Country Coach Owners Club
Join Date: Jan 2011
Posts: 1,000
I had a sensor go bad and they had to remove the genset from the coach to get to it. If they take yours out have them replace everything on that side or stuff that is hard to get to while it's out including the fuel line. I would suggest going to a Cummings dealer to have it done.
Good luck
pumper9x9 is offline   Reply With Quote
Old 01-16-2013, 10:39 AM   #4
Senior Member
Join Date: May 2009
Posts: 259
You should state the make and model of your generator. I have a generac 75D that does not roll out and I replaced my sensor. You need to get the top cover off and in order to do that I had to take off the front panel and the drivers side panel. My sensor was on the back side of the motor near the top. I could not see it but you can see the wire and follow it to the sensor. You can get the wrench size from the new one or just do it by feel. For something I couldn't see it actually wasn't that bad to replace, the covers are the worst part.
2004 Newmar KSDP 3353
Surrey B.C.
srydve is offline   Reply With Quote
Old 01-16-2013, 04:49 PM   #5
Senior Member
Tha_Rooster's Avatar
Join Date: Aug 2008
Location: Georgia
Posts: 4,703
You haven't had the coolant changed have you? So don't know that you just can't refill then by putting the coolant in the reservoir tank.
2007 Fleetwood Revolution LE 40V
Tha_Rooster is offline   Reply With Quote
Old 01-16-2013, 07:49 PM   #6
Senior Member
Join Date: Feb 2012
Location: Baton Rouge, LA
Posts: 1,201
I am aware of three water temperature sensor failures in friend's coaches. In those cases, the generator had to be removed from the coach to get to the temp sensor, not an easy task. Hope yours is easier than that.
Jim and Lynda, (Sophie, Jake, attack trained killer Shi-Tzus :-))

2003 Fleetwood Expedition 38N 2005 Saturn Vue
jlfbatonrg is offline   Reply With Quote
Old 01-16-2013, 07:59 PM   #7
Senior Member
KIX's Avatar

Join Date: Dec 2006
Location: St. Augustine, FL
Posts: 3,580
dkreb, Looks like you got tons of answers.........too bad none of them are to the question you asked.
Visit flightsystems.com and look y=for their RV Generator t-shoot pages. There may be an answer there for you
'02 Ultimate Advantage 40J Spartan MM - Cummins ISC
2013 Jeep Rubicon JK Unlimited
KIX is offline   Reply With Quote
Old 01-17-2013, 08:11 AM   #8
Moderator Emeritus
Gary RVRoamer's Avatar

Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,632
If you disconnect the sensor, you will get a fault 24 instead - no coolant temp sensing - and the genny will shut down after 5 minutes. It won't let you run without receiving a signal from the sensor.

The coolant sensor can be difficult to get at in many coaches and also is fairly likely to be seized in place. There is a heat shield to one side that gets in the way, plus the coach body itself probably makes it awkward unless the genny pulls out on a slide.
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 01-17-2013, 10:12 PM   #9
Junior Member
Join Date: Jan 2013
Posts: 2
7.5 Onan Gen Set Problem

Thanks for all the replies and especially you Gary RV. You are correct about code 24 and saved me a lot of time. I got a wiring diagram from Onan and now know how to get to the wires. but will have to try a different approach

dkreb is offline   Reply With Quote
Old 01-17-2013, 11:22 PM   #10
Senior Member
crah's Avatar
Join Date: Sep 2011
Location: Las Vegas
Posts: 696
Originally Posted by dkreb View Post
Thanks for all the replies and especially you Gary RV. You are correct about code 24 and saved me a lot of time. I got a wiring diagram from Onan and now know how to get to the wires. but will have to try a different approach

You may want to do a search for user Fire up over at RV.net. For some reason I thought he did a very detailed write up on his itasca a while back with pictures.

Craig 2003 Holiday Rambler Scepter 36PST
RR8S 350 Cummins ISC with Banks
2011 Buick Enclave Towed with Readybrute
crah is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
7.5 Quiet Diesel Gen, just finished issue(s) corrections FIRE UP Winnebago Industries Owner's Forum 19 09-03-2017 08:48 PM
Auto Gen Start Temperature Sensor ShapeShifter Monaco Owner's Forum 10 05-15-2010 12:09 PM
Gen set gas line leak DASA National RV Owner's Forum 5 09-23-2009 03:26 PM
Gen Set hours, how many... RonNBama iRV2.com General Discussion 19 08-22-2009 11:47 PM
Fantastic Fan Temp Sensor JavaJelly Newmar Owner's Forum 3 03-10-2007 04:53 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:27 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.