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Hello, my name is***** will assist you.
With the alarm only going off at low speed, this actually sounds like you have a voltage issue on the engine. Make sure that when the engine is at idle you are still getting over 12.5V to the battery.
Use a multimeter to test the voltage at the solenoid and at the battery, make sure that they are nearly identical. If it is low, you will need to test the voltage from the stator going to the regulator.
I have not asked you for a rating, we are still troubleshooting your issue. Have you done the test that I outlined back on the 17th?
Do you have the full model number of the engine?
Thanks, ***** ***** with the process and let me see which model that you have.