Join Date: Jan 2010
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Since you are getting the "low Battery" only in "AUTO" I suggest getting your meter working and testing the voltage at the control head when in auto. I believe that it will not show Low Voltage until the voltage gets well below 12 volts.
I may be able to help with a repair or replacement head if needed and yes, if you replace the head, you can use your present drive and fluxgate if they are OK.
You may also want to check the amp draw on your motor.