Rabbit VT Kero Start
 

Purchased a Rabbit VT Kero Start turbine used just back from service with 0 time on the clock. Initial start attempt had the GSU going into "battery"
After several attempts to start it it did take and ran fine. Watching the GSU closer when initiating start up as soon as the igniter is energized the GSU
shows RPM numbers (turbine is not spinning) for just a second or two it that settles back to zero turbine begins start up procedure if it has not settled
back to zero when the turbine wants to begin the start processes it codes out "battery"
Any ideas......