I have a Atu 200 installed on a Case 7210 and it will not stay locked in. On some passes it will stay locked in the the half mile run and the next pass will disengage 2 to 3 times. supply vlotage says 13.3 then drops to 12.5 when it engages and disengages. Ive tried hooking direct to battery on red wire on Atu cord and still did it and also had alternator tested and that tested out ok. It seems like when it gets off the line and tries to correct quickly is when it does it most. Im not sure if its a voltage issue or possibly something with my anti rotation bracket causing some binding. Anyone have similar issues?