BobbyL199
Generac 27kw model QT02724ANAX. Will not run in Auto or manual. When generator is placed in manual run ppsition engine does not attempt to start it just makes a click and then displays RPM sense loss.  I have changed the battery, the battery cables cleaned the negative engine ground removed the mag pickup cleaned it and reinstalled, tested mag pickup it reads .962 Ohms. 13&16 has 13.8v I jumped wires 13 & 16 nothing happened.  Can anyone please help lead me in the right direction with this. 
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78buckshot
Can you jump battery voltage to the starter solenoid and crank the engine? I would start by making SURE you have a good battery, then check the in-line fuse in the wire near the belt driven alternator, then see if the starter will turn when you energize the solenoid.
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Peddler
Make sure it will turn over by hand, not hydraulically locked and then the starter would be my next stop.
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BobbyL199
Thanks 78buckshot I have a new battery with good voltage, I have not checked the in-line fuse in the wire near the belt driven alternator I actually forgot their was one there I now remember that from the water cooled tech class thanks for jogging my memory I will check it. I did jump the starter with a wire at the starter it just clicked, was that the correct way to jump it at the back of the starter ? 
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BobbyL199
Thanks Peddler I was able to turn the engine by hand it will rotate. Not sure about the starter other than I jumped it at the back of the starter it did not do anything just a slight spark and a little click.  
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Peddler
Probably a bad starter or starter solenoid.
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murphy
Connect a voltmeter, preferably analog because they respond faster, to the battery.  Repeat your jump test.  How low did the battery voltage go?  Anything less than 10.5 volts means the battery is not charged or it is defective.
Battery voltage only has meaning when the battery is under a load.  You can get a battery load tester on Amazon that applies a 100 amp load and displays the voltage at the same time.
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BobbyL199
Thanks Murphy. I Installed a brand new battery and cables and also did a load test everything there was in good shape. Still just a click then goes to RPM sense loss. 
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78buckshot
The RPM Sense Loss fault is due to the engine not starting and running, once you get it started that should not re-appear. It sounds like a bad starter or the solenoid mounted on the starter. I can't remember 100% but I think you have only two wires at the starter, the battery cable and a small wire, if that is correct then by jumping 12 volts to the small wire the starter should crank the engine. If it won't crank then you have a bad solenoid or starter.
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Isslandboy
I had a similar issue on a 16KW, there was a ground hiding in back of the unit, If I remember correctly, the battery ground went to a grounding point and then to the engine/starter, and then starter to frame. The grounding point had some corrosion. I didn't see it until I took the back panel off.
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78buckshot
 Thank you Isslandboy for the mention of  the ground, extremely important on these systems. BobbyL199 is working on a liquid cooled unit, both side panels are removed for inspection/maintenance /repair - very easy to see and access most items including the ground bus and wiring.
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BobbyL199
Thanks Isslandboy I will definitely check that out also.  I really enjoy working on these units I am relatively new at working on them I have a lot to learn about some of the trouble shooting and getting familiar with. This chat really helps with the input and help of some more advanced and knowledgeable techs. 
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BobbyL199
Wanted to thank everyone for their information and input on the 27KW issue. It was in fact the starter causing the issue installed a new started and runs great  !
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78buckshot
Thank you for the update.
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