Chapter 5 - TroubleShooting The Onan, the GMC Genset

Onan 4kw & 6kw engine

One of the things most GMC owners live with is affectionately called "Onan the Barbarian."

Onan Manuals and Bulletins - Click here.


GMC Onan Power Drawer Electrical Trouble Shooting Demo - Duane Simmons, - Click here


— General Information
      — Pre-Trouble Shooting Activity
      — Board to 12 Pin Connector (J2) Cable Wire Definition
      — General Repair Comments
      — Trouble Shooting Aid - No Power Output
      — Trouble Shooting Aid - Will Not Respond to Stop Switch
      — Trouble Shooting Aid - RC Panel is Non Functional
      — Trouble Shooting Aid - No Starter Action
      — Data Form - Trouble Shooting Aid      


Onan Control Board Operation - Circuit Board Schematic, General Repairs,Trouble Shooting Aids, - Click here.


Onan Preventive Maintenance Videos - Duane Simmons  - Click here.

Duane Simmons was known as "Mr. Onan". His vast knowledge of the Onan made him the  expert!


Onan Generator Trouble Diagnoisis (video by Onan) - Click here


Onan Maintenance Schedule - Click here.


Onan Bridge Rectifier Replacement - Click here.


Onan Overhaul Slideshow - Click here.


How to Convert Your Onan to Run on Propane by Jerry Work - Click here.


Numerous  Onan Info Links from Gene Fisher's Website - Click here.


Western States Presentation 10/6/19 - Onan the Barbarian - What Every Owner Should Know - Click here.


Want Your 4KW or 6KW Onan Generator to Run Much Smoother, Start Easier, Be More Reliable!​​​


Do Like So Many Other satisfied GMCers Owners Have Done - Convert It To Bovee's Electrontic Ignition.
Click here.