Thread Tools Display Modes
Old 07-16-2011, 08:55 PM   #1
Junior Member
Join Date: Jun 2011
Posts: 19
Generator problem

I'm about three weeks into my new to me 2007 Georgetown 370TS. I can't get my generator, Onan 5500 to start, or should I say stay running. It will start but as soon as I let off the switch it dies. The code flashes 32, which means "low cranking speed fault". I've replaced both coach batteries, cleaned the cables. I have not replaced the oil or filter yet and the generator only has 92 hours. I can't get into the nearest dealer until mid August. Any clues as to what's going on? The generator is really clean and no leaks of any kind. The fuel tank is full.

Flyboy740 is offline   Reply With Quote
Old 07-16-2011, 09:14 PM   #2
Site Team - Lou
Herk7769's Avatar
Join Date: Oct 2009
Location: South Eastern PA
Posts: 19,810
When my Yamaha does this the oil is low. Most generators have low oil cut outs to save the motor. There is a timer that allows the generator to run briefly to pressurize the galleries but if the pressure does not rise it shuts down. Maybe the oil IS low or the sensor is bad.

Just a thought as I do not have a motor home type generator.


Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
Herk7769 is offline   Reply With Quote
Old 07-16-2011, 10:14 PM   #3
Senior Member
Join Date: Apr 2011
Posts: 313
A few things could cause this. With onan any one or combo of the safe systems such as oil pressure, over / under crank sensors, over temp etc.. will cause the shut down as soon as start switch is released. Also no AC output will cause this. With onan when the start button is depressed the 12 volt systems get their power from the batteries to get started, then as its starting it should start producing 120 VAC when the start button in released it loses its 12 VDC from the batteries and starts receiving it from the gen head side. The gen head is 120 VAC but it is also uses a bit of the 120 and creates a 12V (approx. 10 amp) charge circuit to charge the batteries and run the 12V systems on the gen.
99 F250 Super Cab Short Bed 7.3 Powerstroke
84 24' Yellowstone Camino (oldie)
Acableguy06 is offline   Reply With Quote
Old 07-17-2011, 06:59 AM   #4
Junior Member
Join Date: Jun 2011
Posts: 19
So the real answer is, let an expert fix it.
Flyboy740 is offline   Reply With Quote
Old 07-17-2011, 08:09 AM   #5
Senior Member
fonzie's Avatar
Join Date: Sep 2010
Location: Eastern Ontario
Posts: 2,795
As Lou mentionned, check oil level first and top up if required. Most common condition is low oil.
2011 Rockwood 8319SS with ProPride 3P hitch/GoodYear Marathons/TST TPMS 507
2008 F250 Lariat CC SB 6.8L V10 4.10 axle ratio (NITTO TERRA GRAPLER G2 LT275/65R20E)
Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
Nights Camped: 2011(21) 2012(36) 2013 (17) 2014 (18) 2015 (18) 2016 (36)
fonzie is offline   Reply With Quote
Old 08-02-2011, 10:30 PM   #6
Junior Member
Join Date: Jun 2011
Posts: 19

I went as far as to replace the oil and filter. Still no generator. I've been told it might be the brushes. Guess I'll check them tomorrow. After I get done, maybe I'll open a generator shop....Not..Ha
Flyboy740 is offline   Reply With Quote
Old 08-06-2011, 10:19 PM   #7
Junior Member
Join Date: Jun 2011
Posts: 19
Might have found the problem....A local truck repair station said I should check the brushes. I pulled them out and found one with scaring on it. I took a file and smoothed it out and the generator started and ran like a charm. I will be ordering another set of brushes to replace those I have in it.

Flyboy740 is offline   Reply With Quote

Thread Tools
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

» Virginia Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

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 -5. The time now is 12:56 AM.