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Ford 9N, 2N & 8N Discussion Forum

Best thing to do there

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Author

Rob

10-10-2004 09:49:39

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is to take both the regulator and the genny in to the shop. They will test them both together.
Any alternator/genny/starter shop can do you up right. To troubleshoot electrical problems you really need to start with a full charge on the battery because low volts makes things strange.
Make sure the belt is tight. 1/2" slack with moderate pressure 1/2-way between the crank and genny pulleys. You should not be able to make the genny pulley slip using two hands on the pulley.
Quick check for low genny output is to connect a jumper between the armature and field on the genny. Start the engine and check the ammeter, remove the jumper and compare the ammeter reading. If the charging rate increased when you removed the jumper then the genny is ok so check for a regulator problem. That could be bad wiring. Corroded connections and the like. YOu really need a good ground between the genny and the regulator and there should be a forth wire off the reg to the genny that is a ground. If you don't have that wire then paint or rust on mounting brackets or mating surfaces can cause problems, intermitant problems even.
You might need to rework the wiring cleaning and remaking all the terminations. Repair or replace any damaged, worn or corroded wires. A fresh, $15 wiring harness is maybe the best $15 you will ever spend on that tractor. Close second and third are the $15 copper-core plug wires and the $15 for battery cables. Farm/ranch stores should have all of it. Make sure you get the 'after SN ****' (side-mount) harness.

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