Check that connectors for tractor wiring harness/pto clutch are clean & pins in same not dirty or damaged/discolored due to heat by a possible bad coil in pto also check connectors for a tight fit when plugged together,if pins in connectors ok & bodys plug together tightly,then check current draw on pto coil(probably lt blue/blue on pto sw/harness connector)best guess current draw will be 3.5-4A on coil unless some of the other guys can come up with a better figure.
If pto coil drawing between 3-4A,check battery with a hydrometer or remove & have load checked,you may have a weak/bad battery & depending on alt stator/charging system on eng same may not be able to keep up with current(amp). demand of pto & trying to charge a weak/bad battery.
If battery checks ok,connect a voltmeter across battery,with eng running at normal cutting speed turn on pto & watch voltage at battery,if voltage starts to drop then you may have a problem in alt stator/rectifer regulator(if eng has)ammeter or possible internal problem in ign sw.Depending on eng speed normal charging voltage is between 14-14.5v,less/more than that check charging system on eng,you'll need service/repair manual for your mod eng to troubleshoot/id alt stator used in on eng charging system if you have a voltage problem.
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