Onan Marquis Gold 7000

voltdr · 06-19-2015, 02:30 PM

Help,
While pulling a full load (2 A/C units, and stuff) my generator runs fine for about 30-45 minutes. Then just shuts off. It doesn't give any codes. It restarts immediately. I thought it may be getting hot. I put a fan on it and it seems better until I turn on the second A/C unit.
Any thoughts?
Dan

sgasman · 06-19-2015, 10:43 PM

Almost the same deal changed regulator and that fixed everything

Rich Biebel · 06-20-2015, 08:11 AM

If it shuts of immediately it is the Control Board. A common problem. Heat does cause it to fail. I have changed many of them. The machine might have low hours as I have changed them on fairly new machines as well as ones with many hours.

300-5047 is the part number up until about 2 years ago. Easy to change but a very expensive part.

You can buy a Cummins-Onan part or now an aftermarket is available...

http://www.partsfortechs.com/asapcar...yword=300-5047

Sean Marconette · 06-20-2015, 03:31 PM

Dan,

With Rich's help I was able to resolve the problems on my Marquis Gold 7000. I had replaced the control module with the factory replacement. A few years later same issue but worse, as the generator would not restart until everything was back down to ambient temp. I then replaced the control module with the ASAP. Problem solved. I had codes that were misleading with the OEM module.

If you are bored,
http://classracer.com/classforum/showthread.php?t=41189

Sean

voltdr · 06-22-2015, 10:43 PM

It's unusual because it would restart immediately after shutting down. I even put a fan blowing on the genset but that didn't seem to help. I replaced the fuel filter and the generator ran better the next day. I'm going to pull it out and check the plugs and make sure there aren't any obstructions restricting the air flow.
Thanks for all of the suggestions and help.
Dan

voltdr · 06-22-2015, 10:59 PM

Sean,
I read your link. I have suspected that could become a problem. When I put a fan on it I try to place it so it blows the exhaust away from the inlet. I am going to fabricate a duct to deflect the exhaust away from the air intake.
Thanks for the help.
Dan

06-19-2015, 02:30 PM	#1
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 700 Likes: 77 Liked 87 Times in 47 Posts	Onan Marquis Gold 7000 Help, While pulling a full load (2 A/C units, and stuff) my generator runs fine for about 30-45 minutes. Then just shuts off. It doesn't give any codes. It restarts immediately. I thought it may be getting hot. I put a fan on it and it seems better until I turn on the second A/C unit. Any thoughts? Dan

06-19-2015, 10:43 PM	#2
sgasman Junior Member Join Date: Jun 2014 Posts: 22 Likes: 3 Liked 9 Times in 5 Posts	Re: Onan Marquis Gold 7000 Almost the same deal changed regulator and that fixed everything

06-20-2015, 08:11 AM	#3
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,275 Likes: 25 Liked 510 Times in 200 Posts	Re: Onan Marquis Gold 7000 If it shuts of immediately it is the Control Board. A common problem. Heat does cause it to fail. I have changed many of them. The machine might have low hours as I have changed them on fairly new machines as well as ones with many hours. 300-5047 is the part number up until about 2 years ago. Easy to change but a very expensive part. You can buy a Cummins-Onan part or now an aftermarket is available... http://www.partsfortechs.com/asapcar...yword=300-5047 __________________ Rich Biebel S/C 1479

06-20-2015, 03:31 PM	#4
Sean Marconette Senior Member Join Date: Mar 2006 Posts: 958 Likes: 618 Liked 165 Times in 60 Posts	Re: Onan Marquis Gold 7000 Dan, With Rich's help I was able to resolve the problems on my Marquis Gold 7000. I had replaced the control module with the factory replacement. A few years later same issue but worse, as the generator would not restart until everything was back down to ambient temp. I then replaced the control module with the ASAP. Problem solved. I had codes that were misleading with the OEM module. If you are bored, http://classracer.com/classforum/showthread.php?t=41189 Sean __________________ Sean Marconette 84 Mustang 5060 SS/N

06-22-2015, 10:43 PM	#5
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 700 Likes: 77 Liked 87 Times in 47 Posts	Re: Onan Marquis Gold 7000 It's unusual because it would restart immediately after shutting down. I even put a fan blowing on the genset but that didn't seem to help. I replaced the fuel filter and the generator ran better the next day. I'm going to pull it out and check the plugs and make sure there aren't any obstructions restricting the air flow. Thanks for all of the suggestions and help. Dan

06-22-2015, 10:59 PM	#6
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 700 Likes: 77 Liked 87 Times in 47 Posts	Re: Onan Marquis Gold 7000 Sean, I read your link. I have suspected that could become a problem. When I put a fan on it I try to place it so it blows the exhaust away from the inlet. I am going to fabricate a duct to deflect the exhaust away from the air intake. Thanks for the help. Dan