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Stu - you might try this: 1 � Make yourself 14 or 12 ga or jumper wire about 8� long with an alligator clips both ends. 2 � Place your voltmeter across the battery terminals and set it to the lowest DC volts scale that doesn�t peg the meter. 3 � Start the tractor and run it at full throttle with the lights off. Note the voltmeter reading, also whether it�s holding steady or pulsing up and down. 4 � Turn on the lights and note the voltmeter reading again. 5 � Now take your jumper wire and connect one end to the grounded battery post. Clip the other to the voltage regulator base (shine up the metal where you attach the clip to insure good contact). If the light/voltmeter pulsation stops, you�ve got a bad connection between the regulator and ground. Remove the regulator and clean up the mating surfaces. 6 � If it�s still pulsing, move the jumper wire from the regulator base to the �FLD� terminal (it may be labeled just �F�). If the pulsing stops the regulator is bad � replace it. 7 � If it�s still pulsing when you do #6, remove the jumper wire from the �F� terminal and grounded battery post, and use it to connect the regulator �GEN� and �BAT� terminals (these may be labeled just �G� and �B�) at the regulator. If the pulsing stops again the regulator is bad � replace it. 8 � If it voltage is still pulsing after all the above the problem�s inside the generator. Best to take it to a good starter/alternator shop for service. --- FWIW my bet is you're dealing with a failing regulator!
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