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61  Main Forum / General Discussion / Re: ENGINE COWLING on: September 28, 2013, 01:04:50 pm
Hi Sparky,

I have removed mine a few times.  Put the seats as far back as possible.  Remove the cup holder/storage module, there is a release tab on the bottom of the module and then you lift the module straight up.  I don't recall if you push up or pull down on the release tab, try to get a look at it first.  Release the four locking tabs and slide the cowling to the rear, when it clears the dash pick it up and rotate it so it goes between the seats to the rear.

Be careful to keep all wires and tube clear when installing.

62  Main Forum / General Discussion / Re: What is in the box between the propane tank and the frame? on: September 23, 2013, 07:32:24 pm
Bob, if I never primed prior, my generator would require excessive cranking to start.  So I don't know what more to say.

There is no hard fast rule for everyone because Onans seem to behave differently from one unit to another.  I suppose it comes down to finding what works best for your PC.

Ron, I think you are right in that each generator may behave differently.  My 2010 Onan was difficult to start after priming and after I read the manual regarding priming and starting (see below) I no longer prime and it now starts perfectly.  I was told to prime before starting and that is why I was doing it, but now I don't.  If someone is not satisfied with the way their Onan starts they might try it without priming if their manual reads as mine does.

If the genset ran out of fuel (gasoline models only)
prime the fuel system by holding the control switch
at STOP/PRIME for 30 seconds. (The status indica-
tor light will stay on while the pump is on.)

Start the genset from the genset control panel or re-
mote control panel inside the vehicle (Page 1-4).
1. Push and hold the switch at START until the
genset starts. The status indicator light on the
switch flashes while cranking. It will stay on
continuously when the genset is running.
63  Main Forum / General Discussion / Re: What is in the box between the propane tank and the frame? on: September 23, 2013, 01:05:16 pm
I have the Onan 4000 generator and I was also priming before starting and had the same experience where it took three tries before starting and then would run rich for a short time.  I recently read in the Generator manual that the priming is to be done if the generator ran out of fuel, not every time.  I now do not use the prime and the generator starts on the first attempt.

64  Main Forum / General Discussion / Re: A New Banging Sound After Year #6 - Dead Center In The Headliner Area on: September 12, 2013, 05:32:35 pm
Anyone yet perform that test in driving their rig and feel for gasket-to-roof movement?


Reporting on my test drive today from Taos to Chama, road was rough enough in places to give a good test.  I put my fingers between the cap and cab roof along the side and as far forward as I could reach.  I didn't feel any measurable relative motion between the two surfaces, if I really concentrated I thought I was detecting some movement but it was so small it was probably my imagination.

If you are detecting significant relative movement, then that sounds like the problem - loose screws popping with movement.  Keep us posted on what you find.

65  Main Forum / General Discussion / Awning quit working on: September 08, 2013, 04:40:02 pm
We are two weeks on the road and have been using the Dometic electric awning quite a bit.  Today it will not go out, I hear a click at the motor but no action either out or in.  I have pushed, pulled and twisted to be sure it isn't binding and checked all the fuses.

Any one have a similar problem or some suggestions.  I am in Santa Fe and will try to find a service center tomorrow.

Thanks, Bob

After some online research I found that the clicking is the brake releasing even though the motor doesn't run, probably a burned out motor.  I confirmed this by holding the switch and could then manually move the awning out and in.  I only moved it a foot in case the brake release quit working as well.

I found an RV service center nearby that I will contact tomorrow morning.  Frustrating that we have only used the awning less than 20 times in the past 3 1/2 years and it already has failed.
66  Main Forum / General Discussion / Re: A New Banging Sound After Year #6 - Dead Center In The Headliner Area on: September 06, 2013, 09:40:23 pm

We are two weeks into our five week trip around the southwest, we are in Santa Fe for a few more days but I will check the movement between the cap and roof when we hit the road.  Our 2551 has 24,000 miles on it and I have not heard the noise you describe.  Could something have come loose behind the TV and is bouncing around?

67  Main Forum / Tips and Tricks / Re: Sound under bed in 2552 on: September 05, 2013, 11:22:27 pm
I never would have thought of the Inverter, especially since it is off where we are now camped.  It's very quiet here, so the fan is more noticeable.


My 2010 2551 has the newer Xantrex inverter like yours, below is an old post of mine that addressed the same issue of the inverter fan running when not in use.  Hope this helps.


Yes Billy, I turn off the inverter at night by turning off the breaker that supplies 110vac to the inverter.  I too was bothered by the inverter cooling fan cycling during the night.  I did some investigation because it seemed strange that the cooling fan would run when the inverter was not being used at night.

On the 2551, the inverter is located under the passenger side bed and is mounted forward of the converter/breaker panel on the same wood panel.  First I had to determine if I was hearing the converter fan or the inverter fan.  The converter fan will run if you are plugged into shore power and are using a lot of 12vdc or are charging the batteries at a high rate.  You can feel the air flow in the grill on the converter/breaker panel when that fan runs which it turns out is not that often, and I have never heard it at night.  If you hear a fan noise from under the bed and you don't feel or hear the converter fan running, then it is the inverter fan.

The inverter cooling fan should run when it gets warm from working to create 110vac from the 12vdc batteries, although I don't hear it often when running it to watch TV since the current draw is low.  But I was hearing the inverter fan run when it was not in use.  I replaced the inverter (thanks Kermit) and the new one behaved the same.  So I contacted Xantrex a few times and finally found someone who explained that the inverter cooling fan is designed to come on periodically even when not in use to cool the internal switching relay that automatically switches from shore power to inverter power.  I guess the relay is "on" and passing the ac supply through the inverter when the inverter is off.

So, at night, if you switch off the breaker that supplies the 110vac to the inverter (not the breaker that comes from the inverter), the fan will not run.  You also have to turn the inverter control panel off or the inverter will now use the batteries to keep the TV and DVD player on standby.

Since I love a challenge, I decided to rewire the ac side of the inverter and installed a switch so that I manually put the inverter on line when needed.  So now if I want to use the inverter, I have to press a switch that I installed on the wood panel under the bed in addition to the inverter wall control panel.

68  Main Forum / General Discussion / Re: Problems accessing forum? on: September 04, 2013, 09:39:54 pm
Working fine here.
69  Main Forum / General Discussion / Re: 12 volt power outage? on: September 01, 2013, 06:27:18 pm

Thanks, I have seen those at RV supply stores, I will pick one up.  Saved me from dismantling the bed just to see what it looks like.

70  Main Forum / General Discussion / Re: 12 volt power outage? on: September 01, 2013, 12:38:29 pm

We had a similar problem on our 2012 2551.  Turned out to be a 50 AMP breaker under the passenger bed.  The key item here was that it automatically reset after 4 or 5 seconds.  It is the only component that will auto reset.  Have not had that problem since it was replaced.  

Let me know if you need the part number and I can get it to you tomorrow morning.



I should have read your post carefully, I see that you said it is located under the bed, not in the Xantrex converter.  I took the cover off the converter and did not see a breaker, now after rereading your post I will get under the bed to find the breaker.

I assume that the 12v breaker was added by the factory as additional protection to the individual 12v fuses in the Xantrex converter.

Thanks again, Bob
71  Main Forum / General Discussion / Re: 12 volt power outage? on: September 01, 2013, 12:15:37 pm
If the breaker has an auto restart, then I would think it was planned to trip if it over heated. Since this has only happened once, should you really be worrying about it? It seems it just did its job. The question i think is what were you running that made it over heat?

The bedroom 12v tv, three ceiling lites, and the bath fan, not near 50 amps.  I plan to get the replacement breaker and  see if and under what load it happens again before replacing it.

Also need to check into why there is a 50 amp breaker in a 60 amp panel?

72  Main Forum / General Discussion / Re: 12 volt power outage? on: September 01, 2013, 11:17:17 am

Here the info on the 50A breaker:  Shortstop, 12V, U15 50A

It is auto reset thermal cycling circuit breaker.

A call to the factory should provide you with the manufacturer.
Good luck it is a simple R&R

No markings as to the manufacturer.



I had no idea that there was an auto-reset thermal breaker in the converter.  Sounds like that may be my problem, thanks for the details on the breaker.

This forum is a valuable resource for exchange of information, a grateful "helpful" from me.

Thanks, Bob
73  Main Forum / General Discussion / Re: 12 volt power outage? on: August 31, 2013, 11:02:16 pm

I was not on the inverter, I was on shore power with the converter supplying the 12 volts, not the batteries as they were disconnected.  This has happened only once in 23,000 miles; however, if the converter had ever failed briefly with the batteries connected I would not have noticed since the batteries would continue to supply the 12 volts.

Thanks, Bob
74  Main Forum / General Discussion / 12 volt power outage? on: August 31, 2013, 08:24:36 pm
We are a few days into a trip around the southwestern states and had something happen that has me concerned.

The 12 volt power went out for about 4 seconds.  The reason I think it was just the 12 volts is that the ceiling lights and bath fan went out, but the front TV stayed on and the microwave didn't flash "press reset" as it does when 120 volt power is lost.  The RV has 23,000 miles on it and this is the first time this has happened.

I am concerned that there may be an issue with the 12 volt converter, the batteries were disconnected at the time so the 12 volts was being supplied by only the converter.  Anyone have any experience or suggestions regarding this?

Thanks, Bob
75  Main Forum / Polls / Re: Any pets travel with you? on: August 14, 2013, 02:42:35 pm
We travel with Addie, our cat.  She likes to travel on the back of the headrest and watch the road ahead.  Here we are taking our afternoon "cat" nap.  She has a screen tent for outdoor time, it protects her from mean squirrels, she also has a harness for exploring and taking us for a walk.  She obviously likes RV travel because when we open the RV door in the garage she runs in and is ready to go.
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