Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 08-23-2015, 12:27 PM   #1
Senior Member
Join Date: Apr 2012
Location: Ft Worth, Tx
Posts: 288
Onan KY Series, fault code 13

My Onan 4000 gas genset shut died after running for several hours last Sun. Restrated it and as soon as the roof A/C came on it died again. Shows fault code 13 (undervoltage - reduce electrical load on genset). Started trying to troubleshoot it today and came up with the following -

Oil level good, spark plug good, air filter clean, fuel tank full. Genset will start easily and run indefinitely as long as there is no load on it. Voltmeter shows 121.8 volts at outlet. As soon as I add a load (15k BTU roof air) I hear rapid clicking coming from my transfer switch and the genset dies, showing fault code 13. House batteries test good on multimeter and show 13.2 volts when disconnected from shore power. Chassis battery tests good, but shows just 12.5 volts.

Any thoughts? Slip ring need cleaning? Chassis battery getting weak, near end of life? Transfer switch gone bad? Control board on genset?

Any help greatly appreciated.

2013 Thor A.C.E. 29.2
2017 Toyota Tacoma TRDOR 4x4 toad
Moonshine94 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 08-23-2015, 01:00 PM   #2
Senior Member
BFlinn181's Avatar

Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 17,878
Your battery voltages don't have anything to do with a Code 13 reading or ATS clicking. Code 13, as I'm sure you've read about, (p. 10-9, https://www.cumminsonan.com/www/pdf/.../981-0530C.pdf) requires digging pretty deeply into the body of the generator and a lot more than a multimeter. I'd take it to an Onan service center.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is online now   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Onan 5500 fault code 36 mavric65 RV Systems & Appliances 12 05-07-2018 06:50 AM
Fault code SPN 5585, FMI 18 Diesel Diva Entegra Owner's Forum 22 10-31-2015 08:51 PM
Onan 7K code 14 chiefk RV Systems & Appliances 6 02-24-2015 02:40 AM
Onan code 33 ldfeat Country Coach Owners Forum 7 10-11-2014 09:37 AM
Fault Code and help gatrue Cummins Engines 8 07-01-2014 10:35 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:51 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.