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02-07-2016, 08:32 AM
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#1
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Junior Member
Join Date: Oct 2015
Location: Destrehan, La.
Posts: 4
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Cummins Onan Generator wont start
I have a 2012 American Motor Coach Revolution with a Cummins Onan generator. The problem is that the gen won't crank and there is a Low Batt Voltage fault code. I have run the engine trying to charge it for about 15 min but still won't crank.
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02-07-2016, 08:50 AM
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#2
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Senior Member
Fleetwood Owners Club
Join Date: Jun 2014
Location: Lakeway,tx
Posts: 249
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My gen starts from the house batteries you might want to check them. JD
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Jeff & Steph
2010 Discovery 40x Spartan Cummins ISB
2015 Wrangler Sahara Unlimited
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02-07-2016, 09:29 AM
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#3
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,603
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If you have a battery boost switch, which connects both the house and chassis batteries together, use it and it should provide enough voltage for the generator to start.
If not you could use jumper cables to connect both battery banks together.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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02-07-2016, 09:30 AM
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#4
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Senior Member
Join Date: Mar 2007
Location: Apex, NC
Posts: 1,857
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Martynpaula. Welcome to IRV2.
First you need to charge all your batteries. Running your engine for 15 minutes is not enough. I'm not familiar with your coach, but it should also charge your house batteries from the engine alternator. You should also have panel in the coach where you can check the voltage of both chassis and house batteries. If you have access to shore power, you should plug in and let your onboard charger charge your batteries. If you don't have shore power, you can start your engine, set it on high idle (1000 rpm) and leave it running. While the engine is running, check the voltage of your house batteries, it should be over 14 volts. Let the engine run for 30 minutes. While the engine is running try starting the generator. Hold the switch on start until the generator turns over. It sometimes take a minute before cranking over. The generator has glow plugs that warm the engine before attempting to start.
Once you get the generator started, you can turn your engine off. Then let your generator run for 3 to 4 hours to let your onboard charger charge the.batteries.
Try this and let us know how you make out.
__________________
2010 Winnebago Journey Express 34Y
2010 Freightliner XCS (mfd 9/'09)
'07 Saturn Vue V6
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02-07-2016, 10:51 AM
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#5
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Junior Member
Join Date: Oct 2015
Location: Destrehan, La.
Posts: 4
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Thank you Sir. Voltage was 14.1. Prior to starting engine and on previous attempts to crank the gen. It was 13.8. I ran the engine as you said and after holding the start button for about 30 seconds it fired right up. I may have not been holding the switch long enough on previous attempts. Although I am somewhat mechanically inclined, I am new to this Motorcoach and its elaborate systems.... but I'm learning thanks to people like you.
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02-07-2016, 01:33 PM
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#6
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Dec 2010
Location: DW Driver - Englewood FL
Posts: 1,448
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Quote:
Originally Posted by martynpaula
Thank you Sir. Voltage was 14.1. Prior to starting engine and on previous attempts to crank the gen. It was 13.8. I ran the engine as you said and after holding the start button for about 30 seconds it fired right up. I may have not been holding the switch long enough on previous attempts. Although I am somewhat mechanically inclined, I am new to this Motorcoach and its elaborate systems.... but I'm learning thanks to people like you.
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Take some time tonight and read the owners manual on the products in your MH.
The Generator pulls fuel from the main tank. IF the tank is below 1/3 or 1/4 reserve you may find it won't run once below these levels. That is so you don't run your tank dry and are then unable to start you MH engine. It happen to me when I first started in this RV stuff too. Couldn't figure out why my Generator stopped. Felt pretty embarrassed after that event.
Sometimes I must hold my switch for about 1-2 minutes depending on how cold and how long it was since the last start.
__________________
La Dagobago
99 36 FL Winne Chieftain 5.9 ISB Turbo Cummins DP, 24' box with HD Sporty Hobby of 1970's Suzuki dirt bike restoration. Visit my blog.
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02-08-2016, 03:51 AM
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#7
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Junior Member
Join Date: Oct 2015
Location: Destrehan, La.
Posts: 4
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Thanks again. All this information helps and saves lots of time and money. I spent several hours researching and checking things on this problem and there may not have been a problem at all.
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02-12-2016, 08:44 PM
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#8
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,961
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Quote:
Originally Posted by martynpaula
Thanks again. All this information helps and saves lots of time and money. I spent several hours researching and checking things on this problem and there may not have been a problem at all.
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That is a good outcome. Keep in mind everyone had/has a beginning point, at everything they do/did. No-one starts out an expert.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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02-13-2016, 09:33 AM
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#9
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Senior Member
Monaco Owners Club
Join Date: Jan 2008
Location: Olympia, Wa
Posts: 2,772
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Your Gen starts on the house batteries. Using the emergency start switch you are using both house and chassis batteries for the start. Depending on how the house batteries have been treated by you and the dealer you may either need maintenance on the house battery terminals or new house batteries Or you may just need to keep the house batteries charged. If you are plugged in this should be automatic, if not you should run the Gen 4 hours to get the batteries to near full charge and then keep them above 50% charge at all times otherwise you will have short battery life.
LEN
__________________
2004 Clss C 31' Winnebgo
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