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Old 10-24-2020, 02:11 AM   #1
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Brand: Thor Motor Coach
State: New York
Posts: 14
THOR #18561
Generator help

This is my first season owning a Thor four winds 28z 2018.
I canít seem to get the generator to run. At the demo they had to replace the house battery since it was dead, so they installed a new battery. It then started right up. . It was a quick demo due to COVID.
I tried to run it just to exercise it, but it doesnít even crank over. I am connected to shore power. It could be something simple I am missing. I tried priming it and then hitting start but it doesnít seem to do anything. No lights. I have plenty of gas so itís not that. No oil sensor light. I know Now I have to run more frequently - like I said my first motor home and it was a speed demo. It hasnít been started in 2-1/2 months. Is there another switch I am missing? We literally drove it from the dealer to its current spot. Any help appreciated.
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Old 10-24-2020, 02:20 AM   #2
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Model: Four Winds 31W
State: Michigan
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THOR #9522
House batteries dead?
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Old 10-24-2020, 02:27 AM   #3
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I am currently connected to shore power and battery indicator says full charge
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Old 10-24-2020, 02:29 AM   #4
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I am trying to start at the generator itself but no lights so it almost seems not getting power. This is all new to me.
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Old 10-24-2020, 03:00 AM   #5
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Disconnect from shore power, then check the house batteries. Make sure the batteries are full of distilled water and the terminals are clean and connected. Make sure the use/store switch is in the use position.
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Old 10-24-2020, 03:09 AM   #6
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Model: ACE 27.1
State: Florida
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THOR #7035
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Originally Posted by Dreinig View Post
I am currently connected to shore power and battery indicator says full charge
Which it always will when you are connected to shore power. That battery reading is only accurate when NOT connected to shore power for at least 1/2 hour.

Your house batteries are probably dead. They won't charge unless the USE/STORE (Battery Disconnect) is in the USE position. Don't rely on the "Status LED" that may be associated with the battery disconnect - it will always be lit as well when on shore power regardless of the battery disconnect position. Again, you must be disconnected from SP for that light to be meaningful.

Go connect the battery disconnect
while the batteries charge go to Harbor Freight and pick up a cheap multimeter.
If you need to, go to Youtube university to learn how to use the multimeter.
Go measure the voltage at the house batteries. While connected to SP the voltage should be at least 13.1 VDC, disconnected from SP voltage should be at least 12.6 VDC.

If you verify the batteries are charged and you still get nothing while trying to start the generator you need to verify the 100 amp DC breaker near the house batteries is not tripped.
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Old 10-24-2020, 03:10 AM   #7
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I will try that. I know the use button is on. I will disconnect the shore power. The battery is new so if it is dead than there are other issues. Lord I hope not - I’ve only owned this motor home a few months. Thank you for the suggestion. Glad I took out a warranty policy from eagle rv
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Old 10-24-2020, 03:17 AM   #8
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You may have something with the tripped breaker. We had a power blip last weekend - the lights blinked. I have a surge protector connected to my electrical cord. It may have tripped that breaker. I’ll look for it - my house batteries are in the step of the coach so it should be close by. I need to install my battery disconnect I purchased anyways. I am buttoning it up for the season after this weekend. TY
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Old 10-24-2020, 11:22 PM   #9
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Originally Posted by Lt Keefer View Post
Disconnect from shore power, then check the house batteries. Make sure the batteries are full of distilled water and the terminals are clean and connected. Make sure the use/store switch is in the use position.
Thank you. I have a feeling it is the batteries low on water. I am a little embarrassed to say I didn’t realize I had to consistently check the water levels on the house battery. It is my first RV and it was never mentioned to me when I picked it up from the dealership. It was right when COVID ramped up and was shutting everything down in May. I had been watching videos before I got the RV just to try and learn about it, but oddly enough the water in the batteries never came up - probably because most of the RV’ers on YouTube have the AGM batteries that don’t require maintenance like that
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