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I need the coach to onan qg4000 wiring harness.
It's the wiring you don't install when swapping generators because it's already on the coach but the new harness comes with the new generator.
Shipping to 86046.

QG 4000 harness

Hi and thanks for making contact.
Considering your need for wire harness, just to be certain I get it right…
There are two harness assemblies that communicate the generator to the coach.
One is the 120 volt cabling that conveys the output voltage from the generators main breaker and onto the coaches switch gear then to appliances in the coach.
The other is the control harness that performs start and stop functions.
If you will please let me know which and how long the harness should be, we can help out.
In the case of control harness, are there gauges such as hour meter, voltage for batttery etc involved? Is there an illuminated status lamp?
Again, thank you so very much

Do you have a website?

Sure… WWW.Noahsarkrepair.com

Was going to start a separate thread, but this may be a better choice. I have an 2018 Onan 4000W genny in my coach. It is parked on the side of my attached garage and plugged into 30A wiring. My thought is, other than running a 15/20A extension cord, in the event of a power outage, what options might I have to use the Onan as a backup to my house?

I need the cable that hooks a battery up to start the generator. I think it has a multi plug on one end. I can start it from the generator once I have this cable. Generator is free standing and not in an rv.

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Was going to start a separate thread, but this may be a better choice.
I have an 2018 Onan 4000W genny in my coach. It is parked on the side of my attached garage and plugged into 30A wiring.
My thought is, other than running a 15/20A extension cord, in the event of a power outage, what options might I have to use the Onan as a backup to my house?

Go look at DKOldman's thread about doing that.

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Go look at DKOldman's thread about doing that.

Without going thru a ton of threads, can you narrow the search a bit more? :ermm:

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Without going thru a ton of threads, can you narrow the search a bit more? :ermm:

https://www.thorforums.com/forums/f27/connecting-onan-5500-home-transfer-switch-29616.html

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https://www.thorforums.com/forums/f27/connecting-onan-5500-home-transfer-switch-29616.html

Maybe 6 - 8 weeks ago we had our 1st real live blackout where we had to use the RV generator to supply the house. Have to check to get the exact dates but those in Texas will know when we had the most recent power outages in Dallas area. it has become too common. But we were able to do most everything in the house except run ACs, use Dryer, Stove or run Pool equipment. Both Refrigerators in the house/Garage worked, all ceiling fans worked, the RV was cool, we could cook in RV or outside grill / smoker in backyard. No need to wash clothes in power outage.

One neat thing about using the RV genny is because I have 5500 genny, I was able to run one RV AC off the opposite leg that supplied my House Transfer Switch. This was done to keep some balance across both legs as I only supply up to 30 amps for the house.

I did all of this coming out of the ATS. No modification is required to the Onan systems. My Onan does not know where the draw is coming from. The main thing is getting a good Transfer Switch to the house and to [COLOR="Red"]be 100% sure you have it wired properly so back feed is not possible[/COLOR]. I used Connecticut Electric and had wired my house Transfer switch up years ago to work with my 3500 watt portable generator.

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We are a long standing service and sales dealer for Cummins and Onan.

We have several used Onan generators available.

We also have many used parts as well as shelves and shelves of factory new parts.

In case you are in need, please make contact.

Or, if you just want to ask a technical question or some know how, by all means, send a note. We love being gear heads.

God bless



View this ad at Thor Classifieds - Cummins engines and generators, Onan - Florida

I don't have any issues with my Onan 5500 but I do have questions.

1. Given the EC-30 is discontinued by Onan. Do you have any lying around used that are in good working shape? It would be backup for me that I hope to ever need.

Before you ask, I don't care for Onan new EC-AGS+ with Bluetooth app. If I had free, I would NOT use. I want my genny operation on the wall for all to see and manage not my phone.

2. Do you know of firmware for EC-30 AGS or any solution where the Autostart Limit for EC-30 AGS could be set higher than the existing 12.5vdc? I am looking to go to Lithium, and I would like to have my genny Auto Start at 12.9vdc which would be about 30% SOC for Lithium

Good questions. The EC AGC + is not compatible with lithium batteries per Cummins bulletin TSB 220080. I understand you don't want that one but thought it worthwhile to mention in case others have it in mind. I guess I am obsolete in that I am no fan of lithium battery systems, I have seen the results of the fires and overheats. Also, what's not so known is the slave workers used to dig the stuff out of the ground. In the case of the auto start equipment, there are many makers out there that build auto start systems. We do not typically enter the fray of selecting the auto start equipment. We install those selected by owners for them. That keeps the choice personal. I must say, however, I prefer a start and stop system controlled by the user. I have fears (perhaps unfounded?), of not commanded starts while hands are in sensitive places. I do assure you; I was there when a different generator maker made electronic start and stop controls that did in fact send commands to start while boats were in dealership showrooms. Sorry to not be of help in these issues but I tell it as seen and experienced. God bless

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. I guess I am obsolete in that I am no fan of lithium battery systems, I have seen the results of the fires and overheats.

Lithium batteries in RVs are LiFePO4.
Lithium batteries that catch fire and expand are Lithium Ion/Lithium Polymer

Not the same chemistry or hazard.

Understood on all points. I am too conservative. Hopefully time will prove me wrong.

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Good questions. The EC AGC + is not compatible with lithium batteries per Cummins bulletin TSB 220080. I understand you don't want that one but thought it worthwhile to mention in case others have it in mind. I guess I am obsolete in that I am no fan of lithium battery systems, I have seen the results of the fires and overheats. Also, what's not so known is the slave workers used to dig the stuff out of the ground. In the case of the auto start equipment, there are many makers out there that build auto start systems. We do not typically enter the fray of selecting the auto start equipment. We install those selected by owners for them. That keeps the choice personal. I must say, however, I prefer a start and stop system controlled by the user. I have fears (perhaps unfounded?), of not commanded starts while hands are in sensitive places. I do assure you; I was there when a different generator maker made electronic start and stop controls that did in fact send commands to start while boats were in dealership showrooms.
Sorry to not be of help in these issues but I tell it as seen and experienced.
God bless

You helped in a way by confirming you don't have, or access to any EC-30 AGS systems. I have one been using for 5 years and I am just being a tad overreactive knowing that Onan no longer makes. I have seen many other that AGS system that will work but none do the things the EC-30 AGS did. I know why Onan discontinued but it was knew jerk backwards thinking in my mine. They wanted to advance to Bluetooth and apps and decrease the cost to install the AGS feature with less custom wiring etc. My view is that they should have made them work together or be independent of each other, customers choice.

Just so you know you can start and stop manually with EC-30. You only used the automation for what you need. The EC-30 has many safety interlocks to prevent accidental starts. i.e. It deactivates every time, brake is set or released, every time ignition is turned on or off, after any 30 day period when at least one safety feature has not been invoked. It just damn good system if people knew how they worked. That is on Onan and their Dealer no offense, but my belief.

I don't see anything happening with mine, but if find one Used on ebay or similar I may buy to have a backup. My strategic belief is that 5 years from now, I will not have any need for an AGS because battery capacity will be so great via Lithium or Solid State.

I have my 1st Lithium battery (300ah), I am fan of anything that has features function I need at a reasonable price. I plan to install soon. The EC-30 AGS will work with Lithium it is just that the Auto Start will not auto start until voltage drops to 12.5vdc. That is 14% SOC and may not be as bad as I initially thought.

Thanks for your thread, nice to talk with someone in the field. Maybe one day you will have parts I need, or if you ever run across someone dumping a EC-30 AGS you know who to contact. It is not a need of mine, but a safety blanket versus someone dumping one in the trash :coolsmiley:

Quoted text:

We are a long standing service and sales dealer for Cummins and Onan.

We have several used Onan generators available.

We also have many used parts as well as shelves and shelves of factory new parts.

In case you are in need, please make contact.

Or, if you just want to ask a technical question or some know how, by all means, send a note. We love being gear heads.

God bless



View this ad at Thor Classifieds - Cummins engines and generators, Onan - Florida

I have a 2023 Thor Miramar with a onan 5500. The gen will run anywhere from 15-60 minutes, then die with a code 36. It will not restart until it cools down, then it repeats the cycle.

Any help appreciated.

Hi, we just purchased a 2023 Thor Luminate with 1500 miles. Having a real issue with the generator shutting down. Do you have an email address or phone number that I could contact you to share the breakdowns and get your thoughts? Thank you and God Bless you as well! Denny <‘(((><

[QUOTE=SBBear;422894]Hi, we just purchased a 2023 Thor Luminate with 1500 miles. Having a real issue with the generator shutting down. Do you have an email address or phone number that I could contact you to share the breakdowns and get your thoughts? Thank you and God Bless you as well! Denny <‘(((><[/QUOTE] I don't know where you are in TX, but Cummins Onan several sales and service centers around the state. The one in San Antonio is:210/655-5420 6226 North Interstate 35 San Antonio, TEXAS 78218 You have a 3 year warranty on the Onan RV genset. A great bunch of guys with lots of free advice (IMHO).

Thanks for your reply. I did take it to Cummings SA, they couldn’t find any issues. Their thought is that it is experiencing a fuel vapor lock when using the gen while driving. Gen will run for hours while stationary. I’m looking for suggestions as we can’t travel in the rv as you never know when the gen is going to quit and then no AC.

Get an inverter. Run your coach engine to power it. Have you tried a trip at night to tell for certain it's road heat related? Why not?

Haven’t driven it at night. Coach has spent more time in the shop in the 45 days I’ve owned it. Onan shop thinks it is probably heat related and suggested some aftermarket ducting to better channel airflow but also said they really had not had success correcting it with the duct work.

Why won't you drive it at night and know for sure if their diagnosis is correct? It's a single night of 6 hours or so to know for sure if it's heat as they say of if they're stone cold stupid. So they recommended what they know won't work? Are they drunk or are they just tired of you, because this isn't a normal course of action. Drive it at night. When it fails you'll know they're wrong. If it doesn't fail you'll know they're right. Drive it at night for a trip. Invest the time or sell the rv.

I’ll give a try when I get it back from the dealer next week. What ambient temp would create the fuel vapor lock when combined with road temp snd exhaust.

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Get an inverter.
Run your coach engine to power it.

Have you tried a trip at night to tell for certain it's road heat related?
Why not?

150+ amp additional load on the alternator is a recipe for an additional problem.

Sorry, not sure what you mean by 150+ amp load on the alternator?

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Sorry, not sure what you mean by 150+ amp load on the alternator?

He told you to use an inverter to run your rooftop A/C while driving instead of the generator.

The A/C draws 15 or more AC amps.

That equates to 150 or more DC amps on a 100% efficient inverter.

Those amps would have to be supplied by the engine's alternator, which is already supplying between 30 and 80 amps.

I'm not sure what size alternator is on your engine but an average 165 amp alternator would be burning up.

Ok, thanks. Sounds like I could create more issues. Probably wait to see what the dealership finds out.

When an Onan generator has an un-commanded shut-down, it will usually show the reason it shut down, if interrogated. IE. 4 years ago when I went or exercise my generator, it would start, rev up and then shut down. The interrogated reason for the shutdown was "over rev'. That means the governor has no control of the engine's RPM. On further investigation of the governor linkage, I found a huge dirt dabber's nest encasing the springs and levers. Fortunately, I have a pressure washer. Once the nest was dissolved, the generator started and ran perfectly.

sure, [email]books@noahsarkrepair.com[/email] that goes to Launa who runs the office and goes to my mail as well. mine is [email]mike@noahsarkrepair.com[/email] but there are times i am not at desk and miss comms. God bless

send me a note. i am sure we can get past it

Hi, sorry your are having this trouble. code 36 is for an unnamed shutdown but it almost always fuel starvation. as the engineers developed the currently used software they lumped lots of things into 36. you will find nearly all are fuel starvation. so, some things to look at. the fuel hoses and pipes that supply your generator should be 1/4 inch inside diameter. its almost inverse logic but here is how it works. a column of fuel that is 1/4 inch diameter weighs less that a same length column that is 5/16 or 3/8. add to that, the frictional surfaces of a 1/4 inch hose compared to 5/16 or 3/8 and you can see it is much easier for the fuel pump to transfer the smaller column of fuel. remember the functions of an engines fuel. combustion, coolant to fuel system parts, lubrication to those parts. there are times we see 1/4 inch hose installed but the installer accidentally left tight bends and kinks. any restriction adds to the stress of the pump. cummins has very specific air flow tests on this model machine. its called hot air re-circulation. your machine induces the air for combustion and cooling from the bottom. the air passes over the engine, generator winding group and exhaust pipes. it then shoots straight down. if the heated air is able, it will be induced into the cooling air uptake. if so, it can evaporate the fuel in the engines fuel system. finally, its very very possible that your machine simply has a failed fuel pump or maybe carburetor or injection system. please note, fuel delivery issues are not cummins warranty but a problem of the installer. we cut straight to the issue by connecting a test fuel tank with only a foot or two of hose right to the fuel pump. in all concerns, isolate the generator from the coach, boat or building. keep in mind that its possible the coach hurt the fuel pump and installing a new one may cause the same problem if i fact there is a problem on the coach. Cummins sells a very good extended warranty that is real warranty. it takes you out to 5 years. your standard warranty is 2 years or 2000 hours for everything. beginning year 3, the engine assembly and alternator is covered but many small items are not. emissions components on any engine are mandated by the fed to be covered for 5 years. hope some of this helps. let me know how it works out. i have trouble tracking messages and and i am missing some..God bless ya