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Old 05-20-2016, 03:55 PM   #1
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Generator Problem

When I go on the road and start my generator to run everything during the trip it stops after the motor warms up. Usually about (15 min.) I can hit the start button and it restarts. let off the button and it dies. I changed the start button and it still stops. Any help would be appreciated.




1997 CC magna aspire Detroit 330 HP Turbo 6spd Allison Transmission
PowerTech 7000kw with Kubota motor
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Old 05-20-2016, 04:19 PM   #2
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Originally Posted by Jerry226 View Post
When I go on the road and start my generator to run everything during the trip it stops after the motor warms up. Usually about (15 min.) I can hit the start button and it restarts. let off the button and it dies. I changed the start button and it still stops. Any help would be appreciated.
The Manual for my PowerTech generator provides trouble shooting steps in a rear section of the manual. (I got an electronic version from PowerTech web site.)

It would be helpful if you identified your rig model and vintage, and the manufacturer of the generator that you have.

You might have a broken fan belt, oil level too low, fuel starvation, coolant too low, heat too high all of which might trip a sensor.

The manual trouble shooting steps go into detail about how to test based on results of previous test. Too much to reprint here.
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Old 05-20-2016, 04:36 PM   #3
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Thanks Dean I tried all the above. I can start the generator when the big motor is not running and it will run until I shut it off.
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Old 05-20-2016, 05:26 PM   #4
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Do you have a generator auto start.

The generator may shut down due to the engine charging system bringing the batt voltage up to the set point.

Just a guess.
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Old 05-20-2016, 07:20 PM   #5
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Since it's not an immediate shutdown when you start the drive engine, it's likely not electrical interference or interruption from the alternator, AGS, or inverter. I'd look more to the fuel pump, cooling problem, or air starvation, or vapor lock due to too much vacuum in the main fuel tank.

If you google this issue there are numerous examples on this and other forums experienced across all types of diesel and gas rigs, and genny makes.

I've got the same genny as you and it has only shutdown while driving in 100+ degree F ambient temperature. I can usually restart it after 20 minutes of cooling after checking coolant level.


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Old 05-21-2016, 11:02 AM   #6
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I had a similar problem with my Onan diesel. It was the temperature sending unit. Onan has had a high failure rate on them.
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Old 05-21-2016, 04:46 PM   #7
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My Generator has a Kubota diesel motor. It will start and run forever if there is fuel. when I start my coach and then the generator it will run until the motor on the generator get warmed up. it will stop running. I can push the switch up to start and it will restart. I then have to put the switch back in the middle to stop the starter motor. then it dies. it will re start every time but dies when put back in the middle. This has a new switch. up is start. middle is run. down is pre heat and stop.
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Old 05-22-2016, 12:10 PM   #8
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My Generator has a Kubota diesel motor. It will start and run forever if there is fuel. when I start my coach and then the generator it will run until the motor on the generator get warmed up. it will stop running. I can push the switch up to start and it will restart. I then have to put the switch back in the middle to stop the starter motor. then it dies. it will re start every time but dies when put back in the middle. This has a new switch. up is start. middle is run. down is pre heat and stop.

I also have the PT7000 generator but a different remote switch.

You can disconnect the remote switch, as the manual directs in the trouble shooting section, to remove any chance it is the problem. Just use the start switch on the generator.

If you have followed all the steps in the trouble shooting guide for "starts but won't run" and have assured yourself that the fan belt is good, then it would seem the next step is to take it to a generator specialist.

The only interaction I can imagine between the engine alternator and the generator is the recharging of the house battery when both power sources are running.

The chassis battery on my rig is not recharged by the generator and I have a dedicated generator start battery.

If you have gen auto/start installed that is set for recharging the house battery, I can imagine in a few minutes of charging by a 160A alternator and the generator combined could result in a battery full message and generator shutdown.
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Old 05-22-2016, 12:20 PM   #9
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First Check the fluid inside the radiator and not the overflow container. Look for a small cover on top. You may be surprise to find a radiator cap.
If you do have a separate radiator cap (Not The Overflow Container). Then take the cap to any auto parts store and get a new one. Please let us know if I was correct.
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Old 06-28-2016, 06:32 PM   #10
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I bought a new radiator cap and it didn't help. changed oil filter, fuel filter, air filter. No change. I also bought a new transfer switch, no help.
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Old 06-28-2016, 06:41 PM   #11
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Did you disconnect the remote switch?
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Old 06-28-2016, 07:07 PM   #12
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FWIW The only way it would be an electrical problem would be if something was shutting off the 12 VDC back to the generator controls. It really sounds like one of the protection sensors. The fact that it runs while you hold down the start position thus bypassing some of the sensors is part of what I am basing that on.
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Old 06-29-2016, 03:32 PM   #13
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Where are the sensors located???
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Old 06-30-2016, 04:50 AM   #14
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FInd the manual for the generator to learn where things are. What you have for sensors and where they are depends on the generator you have. You at least have an oil pressure sensor and probably several more.
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