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Old 05-28-2019, 03:18 PM   #1
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Brand: Thor Motor Coach
Model: RW28
State: Florida
Posts: 11
THOR #12200
Gen Primer is on when temp is below 70 Degrees

We have an interesting situation here.

We have a 2018 Quantum RW28, the Generator Primer kicks on when the temperature is below 70 degrees. The RV aka La Tortuga II, does not have an Auto Gen Start.

It has gone to the dealer, they replaced the wiring harness from the Generator to the inside Start Switch, the problem continues. I disconnect the wiring harness from the Generator and the problem stops.

Does not matter if the shore cord is plugged in or not, does not matter if the coach main battery power switch is on or off.

The dealer is trying to figure it out, Thor says its an Onan problem, Onan sys its a Thor problem, that is what I believe, its a Thor issue but in reality it is my problem. La Tortuga II is still under Warranty.

It goes back to the dealer on 03 June.

Any thoughts?
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Old 05-28-2019, 05:21 PM   #2
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 913
THOR #2631
Hi, well a new and exciting problem. Gen and hydraulics are usually DC powered from coach batteries through a 100 amp resettable breaker fed off the battery string, so use/store switch is likely not involved, but I don’t know your coach specifics either. Normally the gen MCU controller has a ground wired out to the local and remote start/stop switch. Sounds like you only have a remote gen panel on/off issue since the trouble stops when the remote harness is disconnected from the gen. When the gen is not running, pressing the stop switch connects the controller wired ground back to the controller stop pin which starts the fuel pump prime function. When the gen is running, one press and release of the stop button will stop the gen using exactly the same wires.....the controller is the brains (running or stopped). So the question is where is the ground coming from on the controller “stop” pin when the gen is actually stopped and you hit 70F or below? The other “wonder” from my little brain is when the gen is running and you hit 70F or below does the gen automatically shut off? Is the 70F ambient or below have to be at the remote or at the gen end?
My first WAG is check the remote gen panel switch (disconnect the center ground wire being careful not to short it to anything and see if the problem repeats at 70F or below). If it repeats then the ground to the controller stop terminal is coming from somewhere else (chafing somewhere the harness got pulled through maybe?). Nothing like a good head scratcher to keep the grey matter moving and the blood pressure high (if you are the owner).
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Old 06-08-2019, 12:59 PM   #3
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Brand: Thor Motor Coach
Model: RW28
State: Florida
Posts: 11
THOR #12200
Update

Just a quick update, took La Tortuga II to the RV Dealer, at first they were a bit hesitant to deal with the Generator problem but it started to rain, the tech went out to close the door and the Generator primer started to pump. They were about to open a wall but then decided to check the wiring harness under the MH, they found a staple had just barley punchered through a wire and was rubbing against the frame, grounding the generator, removal, tape and so far, no more primer problem. Even though we love our MH, it does seem that THOR is in too much of a hurry to manufacture and their QC is not what it should be.
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Old 06-08-2019, 01:52 PM   #4
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 913
THOR #2631
Talk about a lucky find....sometimes you need a horse shoe in the right place to find those "hair puller" troubles. Glad the tech spotted your factory supplied staple damage. Thanks for posting the solution and happy camping.
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Old 06-08-2019, 02:16 PM   #5
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Brand: Thor Motor Coach
Model: Axis 24.1 Windjammer
State: Indiana
Posts: 1,057
THOR #7074
Better than that Javelin your diagnosis Was Spot On!!!
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Old 06-08-2019, 04:24 PM   #6
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 913
THOR #2631
Well sometimes the "fog" clears and I get pretty horse shoe close. We can all use some luck in life......sometimes timing and the right series of folks at the right time can save your bacon in life and for RV troubles too. The forum troubles are a great way to keep learning new things for everyone; experienced and newbies.
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