Internet Idiot's Guide for GMC MotorHome Information


 Chapter 5 - TroubleShooting The Onan, the GMC Genset

  •    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 Bridge Rectifier Replacement — 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.

   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  Electrontic Ignition — Click here.

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

Below are a number of informational links to help keep that Onan running smoothly.