Thread Tools Search this Thread Display Modes
Old 03-03-2007, 09:48 AM   #1
3 Rivet Member
Join Date: Apr 2003
Posts: 119
Onan generator run problem

Hi Guys,
My Onan in my 1988 Classic stops running as soon as I release the start button. It will run fine as long as the button is held in (fortunately this has not damaged the starter). It starts up great, runs great, comes on line with AC power, but my finger gets tired pressing the start button. Oil and gas levels are full.
It seems to me that a relay is not changing state as this problem has gotten progressively worse. Some days it would start and run as it should but not anymore. I will see if I can find and bypass the oil pressure switch and the fuel level sensor switch. Any other suggestions?

(This is the same post I put as a reply to another lengthy thread - generator troubleshooting - I thought it might get lost there). I hope I am not violating protocal in doing so.

AccessMaster is offline   Reply With Quote
Old 03-03-2007, 10:40 AM   #2
Rivet Master
GlenCoombe's Avatar
1984 28' Funeral Coach
Belleview , Florida
Join Date: Jun 2005
Posts: 1,635
Images: 27
Are you starting from the remote switch? If so you might want to disconnect the remote switch and attempt to start at the panel on the genset.
This will tell you if the switch is bad. I suspect you may have a switch that is defaulting to stop after you release it. Good luck.

Glen Coombe AIR #8416
1984 28' Funeral Coach
Former Rolling Showroom & PuttLab (now party bus)
"I'm not an expert. But I did sleep in an Airstream last night."
GlenCoombe is offline   Reply With Quote
Old 03-03-2007, 12:44 PM   #3
3 Rivet Member
Join Date: Apr 2003
Posts: 119
That is a good tip. It does not matter what switch I use including the one at the Genset. However, if one of the switches were defaulting to the off position and holding any of the switches in the start position overides it .... I will check that out. Thanks.
AccessMaster is offline   Reply With Quote
Old 03-03-2007, 03:54 PM   #4
3 Rivet Member
Join Date: Apr 2003
Posts: 119
Thank you to GlenCoombe. You were right on. The wiring harness from the dash and control panel switch had several issues where it plugged into the genset control box. I disconnected the plug and pulled out the control board from the genset. Not only was the incoming wiring corroding and shorting to ground on occasion, the stop terminal on the genset switch also was shorting to ground.
Sure enough if you hold the start switch down it will provide a circuit to keep the motor running until it is released at which time the stop circuit takes over and shuts the unit off.
I may still have more wiring issues at the switches inside the coach, but for now I have control of the unit from the switch on the genset. The rest is just details.
Thanks again for the diagnosis.
AccessMaster is offline   Reply With Quote
Old 03-03-2007, 05:31 PM   #5
Rivet Master
Fyrzowt's Avatar
2000 25' Safari
West of Fort Worth , Texas
Join Date: Aug 2006
Posts: 6,697
Images: 8
That's one reason I love this site. Karma to Glen.
Fyrzowt is offline   Reply With Quote
Old 03-03-2007, 06:30 PM   #6
Rivet Master
Commercial Member
lewster's Avatar
Currently Looking...
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 6,822
Good Call Glen!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!:d

Lew Farber...RVIA Certified Master Tech...ABYC Certified Master Marine Electrician
lewster 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
Engine Revving Problem winner Mechanics Corner - Engines, Transmission & More... 19 02-08-2010 10:05 PM
Generator onan Paul Daugherty Airstream Motorhome Forums 6 11-26-2002 12:51 PM
Inverter problem Don McKelvay Electrical - Systems, Generators, Batteries & Solar 2 11-03-2002 05:40 AM
Electrical problem resolved davidz71 Electrical - Systems, Generators, Batteries & Solar 5 08-12-2002 08:21 PM
Electric Brake Controller Problem Don Brakes & Brake Controllers 4 04-15-2002 01:05 PM

Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:49 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.