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Chapter 5:
GMC MotorHome Generator
(Troubleshooting the Onan)
There are several informational links listed here to help keep
that Onan running smoothly. There are also a variety of
videos on You Tube dealing with gasoline-fired Onan’s
similar in size. They may be of assistance in some way.
✦
Numerous Onan Info Links from
Gene Fisher's Website —
http://gmcmotorhome.info/list.html#GEN
✦
Onan Generator Trouble diagnosis by Onan —
http://www.youtube.com/watch?v=tJcwLyrHMq4&feature=gv&hl=en
✦
GMC Onan Power Drawer Electrical Trouble Shooting Demo - Duane Simmons -
“Mr. Onan” —
— 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
http://gmcws.org/Tech/dsimmons/onan_demo/
✦
Onan Preventive Maintenance Video - Duane Simmons "Mr. Onan" —
Duane was known as "Mr. Onan". His vast knowledge of the Onan made him the
expert! He is dearly missed.
http://gmcws.org/Tech/dsimmons/dsimmons.html
✦
Onan Manuals & Bulletins Etc. —
http://www.bdub.net/manuals/index.html
✦
Onan Control Board Operation -
Circuit Board Schematic, General Repairs,
Trouble Shooting Aids and lots more information —
http://gmcws.org/Tech/dsimmons/onan/onan.html
✦
Onan Bridge Rectifier Replacement —
http://gmcmotorhome.info/generator.html#bridge
✦
Onan Pertronix Electronic Ignition Conversion —
http://gmcidiotsguide.com/joomla/gmc-products/product/27-bovee-s-electronic-
ignition-kit/category_pathway-25
✦
Onan Overhaul Slideshow —
http://www.cathy-ron.com/GMC%20Generator.html
GMC MotorHome Information
Page 9
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Revised July 2014