Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > RV SYSTEMS AND TECHNOLOGIES FORUMS > RV Systems & Appliances
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  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 05-19-2022, 07:58 AM   #1
GT1
Junior Member
 
Join Date: May 2022
Posts: 10
Onan QG 2500 not cranking, no control fuse found

The Onan RV QG 2500 LP generator stopped cranking on my Airstream Interstate, I believe it is related to winter driving, I drove about 10,000 miles this winter, and in one of these days the generator stopped working (canít crank to start)

The manuals are clear, change the 5-amp control fuse, so I went under the RV and opened the cover and there is no control fuse :(

There is a circuit breaker, the start and stop button and the light, none of them are also working, but no control fuse to be found, like there is no place for a control fuse?

If anyone experienced the same issue, please let me know, there is most likely a control fuse for that specific model somewhere, but not as in the manual
GT1 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 05-19-2022, 08:38 AM   #2
Senior Member
 
Join Date: Mar 2021
Posts: 314
If you have the control fuse 5a (slow blow) you can see where it should be by going to this site. One of the pictures shows the fuse location.

Reset Onan Circuit Breaker

If you have an electronic governor the fuse should be a 10a fuse instead.

Maybe the holder fell into the compartment?

Good luck!
gjames50 is offline   Reply With Quote
Old 05-19-2022, 09:24 AM   #3
GT1
Junior Member
 
Join Date: May 2022
Posts: 10
Thank you for the help, I saw that link earlier when searching

The Onan RV QG 2500 LP generator have an on and off button and a circuit breaker, but no place for a fuse that I can see, and that is very confusing
Attached Thumbnails
Click image for larger version

Name:	Screenshot 2022-05-19 112251.png
Views:	7
Size:	872.6 KB
ID:	365953  
GT1 is offline   Reply With Quote
Old 05-19-2022, 11:04 AM   #4
Senior Member
 
Join Date: Mar 2021
Posts: 314
Should be above your Circuit Breaker in your picture. Has it detached and fallen inside the housing/shroud?

I can't see an alternate location for that model. Maybe on the control board itself?
gjames50 is offline   Reply With Quote
Old 05-19-2022, 07:00 PM   #5
GT1
Junior Member
 
Join Date: May 2022
Posts: 10
I am not sure if it detached, does not appear like anything detached, the manual is saying there should be a fuse, but the manual is also a copy and paste for many generators ☹

The irony is that no one has time to look at it for the next 3 months, and I spent days learning how to fix it, then found there is no fuse in the expected location 😊

It is also not easy to disconnect the entire thing, it is under the RV
Attached Thumbnails
Click image for larger version

Name:	Screenshot 2022-05-19 205948.jpg
Views:	9
Size:	229.0 KB
ID:	366005  
GT1 is offline   Reply With Quote
Old 05-19-2022, 07:05 PM   #6
GT1
Junior Member
 
Join Date: May 2022
Posts: 10
Also, another thing that does not look right is the location of generator, under the motorhome! That is a very fragile location, it is exposed to water during driving, snow, and salt. It either has to be designed for that, or well protected
GT1 is offline   Reply With Quote
Old 05-20-2022, 01:17 PM   #7
Member
 
Join Date: Sep 2020
Posts: 86
Some more photos around the genset's start/stop panel, breaker, etc., not cropped so the photos show more of the surrounding stuff for context, would be helpful.

Full model number (the super long thing including spec., etc., like: "2.5HGJBB-1121") would help as well.

Does it click when trying to start, or just nothing?

Going purely off appearance from your last photo, this may be the service manual for your genset:
https://rockymountaingeneratorsupply...e%20Manual.pdf
And parts manual:
https://rockymountaingeneratorsupply...s%20Manual.pdf

If yours is a HGJBB model, then I don't believe yours has a control fuse.
whybother is offline   Reply With Quote
Old 05-31-2022, 08:36 PM   #8
GT1
Junior Member
 
Join Date: May 2022
Posts: 10
Update: I took it today to the mechanic, and they lifted the motorhome and disconnected a 9 pin cable that connects the generator to the RV, and none of the pins had any power in them.

No one was able to find any 5 amp fuse in the generator, so Onan QG 2500 LP has no 5 amp fuse I guess.

I have now to go through the Airstream Interstate schematics to find the next possible fail point.
GT1 is offline   Reply With Quote
Old 06-10-2022, 09:41 AM   #9
GT1
Junior Member
 
Join Date: May 2022
Posts: 10
It has been 5 months since this Onan Generator under the motorhome stopped working, and no one is able to fix it, lesson learned

1- Avoid the Onan QG 2500 LP (Loud Generators) at all cost!
2- Avoid in the future buying a motorhome with a generator under it, that is plain stupid
GT1 is offline   Reply With Quote
Old 06-10-2022, 10:04 AM   #10
Senior Member
 
Join Date: Mar 2021
Posts: 314
Quote:
Originally Posted by GT1 View Post
Update: I took it today to the mechanic, and they lifted the motorhome and disconnected a 9 pin cable that connects the generator to the RV, and none of the pins had any power in them.

No one was able to find any 5 amp fuse in the generator, so Onan QG 2500 LP has no 5 amp fuse I guess.

I have now to go through the Airstream Interstate schematics to find the next possible fail point.
No Power at all is strange. Have you checked the connections (main battery cables) that connect to the generator? On both the Gen and Battery ends. For many either a corroded connection or connector was the cause.

Some have said there might also be an Inline fuse/fuse link that could exist in one of the harnesses.

Your Onan Model Number and Serial Number might also help me. Can you post it?

Also the year and any more model details on your rig could also help.

I'll do some more digging and if I find anything I'll post again.
gjames50 is offline   Reply With Quote
Old 06-10-2022, 10:43 AM   #11
Senior Member
 
Join Date: Mar 2021
Posts: 314
The only thing of interest I could find is that I believe your 12VDC connection (main battery) to your Gen has no disconnect switch but should have Large Fuse(s) (possibly 125AMP).

Most everyone with a no-crank issue says it's probably battery cable related. Even the STUD on the Gen Set that passes through the Gen Housing can have a Snapped Connector to make sure power is going through those and inside to the gen itself.
gjames50 is offline   Reply With Quote
Old 06-10-2022, 02:16 PM   #12
Member
 
Join Date: Sep 2020
Posts: 86
I would start by checking for voltage at the positive and negative battery connection terminals on the genset, and make sure the connections are secure and free of corrosion:
https://www.norwall.com/product_pdfs...18.pdf#page=44

If you're getting ~12 volts there, then there's probably an issue with genset. If not, then follow those connections back, testing for voltage all the way, until you get to the RV's battery.
whybother is offline   Reply With Quote
Old 06-10-2022, 02:27 PM   #13
Senior Member
 
96 Wideglide's Avatar
 
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 8,825
The fuse that protects the power cable to the gen starter should be much larger than 5A.

It 'should' be near the batteries.
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
96 Wideglide is offline   Reply With Quote
Old 06-11-2022, 08:45 AM   #14
GT1
Junior Member
 
Join Date: May 2022
Posts: 10
Generator Info:

Onan QG 2500 LP
Model 2.5HGJBB-1121B Spec: B

I will be taking it to a new Generator maintenance place 200km from here this week, hopefully they can look at it.

The things that bugs me, I bought Airstream Interstate and paid the premium price for design and luxury, and still, these things are full with small issues.

And installing a generator under the RV and having it exposed to the weather, it is just not something that makes sense to me, we do drive this van in the summer and in the winter, on dry roads, wet roads, and snow roads.

Then the generator itself is full with electronics, these should not get wet!

Hopefully it gets fixed this week.

Thank you so much
GT1 is offline   Reply With Quote
Reply

Tags
fuse, onan



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 emerald 5000 (from 2000/ 750h) cranking but not starting Ruediger Vintage RV's 13 12-18-2021 02:29 AM
Not cranking or starting - melted bsti fuse Terra02 Workhorse and Chevrolet Chassis Motorhome Forum 4 12-23-2020 04:10 PM
Onan 8000 Diesel Generator Not Cranking zonasteve New Member Check-In 3 03-25-2019 11:13 AM
GMC Yukon 2500 or Suburban 2500 as a tow vehicle Keen Family Trailer Towing and Tow Vehicles Discussion 23 11-27-2017 01:20 PM
Ram 2500 vs Chevy 2500 Sloopygirl Trailer Towing and Tow Vehicles Discussion 20 09-15-2013 06:25 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 07:07 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.