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 03-09-2014, 04:23 PM   #1
Junior Member
Join Date: Jul 2010
Posts: 8
Onan Marquis Genset turns on by itself in rain?

Driving up the interstate in rain all day, our Onan Marquis generator turned itself on twice within a couple of hundred miles, March 2014. I read some posts from 2008 and some said it could have been due to water shorting out the switch or the batteries being low. Since we were driving when it occurred and the batteries check out fine, I'm going with the water doing it.

My coach is 2013 Itasca Sunova 33C. Anyone had the same problems recently, especially with this model? I'm going to the Winnebago Rally and might have it checked out while there. Any comments are welcome!

Thanks, Elliot

Rvbiker 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 03-10-2014, 05:19 AM   #2
Senior Member
94-Newmar's Avatar
Join Date: Nov 2009
Posts: 2,043
Elliott, there is a wiring harness connector (4 wires) that connects your START/STOP switch(es) from inside the coach to the generator. That connector is right there either just outside the cover or just inside the cover of the generator. You can easily pull the connector apart and check for signs of water infiltration in the connector itself, such as any white powdery substance, rust stains, maybe even moisture still in there - It's supposed to be weatherproof.... Check for chafed wires on either side of that harness too. A bare wire rubbing against a frame somewhere could be the problem, and of course, when it's wet could exacerbate the problem.

94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
94-Newmar is offline   Reply With Quote
Old 03-11-2014, 11:55 AM   #3
Junior Member
Join Date: Jul 2010
Posts: 8
Thanks much, that would make sense, will give it a look.
Rvbiker 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
Onan Genset 5000 Johntraveler iRV2.com General Discussion 9 03-10-2014 11:10 PM
Can a Onan 5500 watt Marquis Gold be converted to propane Jasper7821 RV Systems & Appliances 22 01-23-2014 07:45 PM
Onan genset issue, code 32, $1500 repair? Shadow520 RV Systems & Appliances 5 11-18-2013 10:48 AM
Onan Genset NHE not starting... 88Shasta RV Systems & Appliances 6 10-04-2013 03:18 PM
Alternator on an Onan genset red raby RV Systems & Appliances 3 07-27-2013 06:01 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:03 PM.

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