Small Engine Troubleshooting Problems? Ask a Mechanic Now.
What is the serial number of the genset?
The first thing you need to do is to connect a frequency meter to the output leads of the genset, and test the output frequency.
What frequency reading do you get?
I need to know the frequency reading.
Right above the oil cooler is a stud with a wire #18 attached to it.
Set your meter to ACV.
Connect one meter lead to a good engine ground.
Backprobe the other meter lead into wire 18.
Crank the genset.
How much voltage do you see during cranking, and how high does the voltage go for the 2 or 3 seconds that the engine will run?
I will be unavailable for phone calls for the rest of the week.
Since the unit is only getting to 45 Hz, but is shutting down on Over Speed, and you have good voltage at wire 18, then the controller has been compromised in the power surge. You are going to need a new controller.
The part number is *****
I do not know the cheapest place to get it, as I have to get my parts directly from Generac.
Yes. The D is just an upgraded version of the B.
Yes, you need to rate my performance for me to get credit for my time.
You can rate now if you like, or wait until you change the controller.
The 0H6680A is no longer available. The new number is *****
But the 0H6680D is an upgrade from the B version.
I did forget that when switching to the D version, you must also purchase an upgrade kit that has the new wiring harness.
The part number for the kit is 0H6680DSRV.
We do not supply parts. You would need to get it through a Generac dealer.
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It should not require a different harness.
As long as you get all the wire numbers matched correctly, there is not reason you should not be able to splice it.
There is no one that I know of that rebuilds those boards - not even Generac.