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MF135 Regulator

R

Russell Dewsnup

Member
I picked up an MF135 Diesel, 12V with a generator. The tractor has sat for several years without a battery in it. I have it running but am not getting a charge from the charging system. i was told to polarize the regulator. I have found info about polarizing the generator but not about polarizing the regulator. Is this the same thing? or what do I need to do to polarize the regulator? Do I need to polarize both the generator and the regulator? Thanks for any help.
 
When polarizing the system both are done at once. Use a jumper wire from the battery plus and touch it to the generator armature terminal. Another quick check is to remove the generator wires, remove the belt and see if the pulley will "motor" with the jumper wire hooked to the armature terminal. If not, check and see if one or both brushes are stuck in the holders. Sometimes just freeing them up will fix it. If the generator will motor, but not charge at half throttle or more, ground the field terminal. If it charges then generator is OK, but regulator needs the point sets cleaned, usually that will fix them.
 
You polarize the generator not the regulator. It gets confusing because new regulator instructions tell you to polarize by momentarily jumpering BAT on regulator to ARM or GEN on the regulator.

More specifically, when momentarily toughing hot battery to Armature post of generator, a short burst of current is sent through the generator field coils. This puts a magnetic charge on the iron pole shoes at the center of the coils. This magnetic charge determines the output polarity when engine is started and generator begins to rotate.

Be careful when touching armature post on generator that you do not touch the screw threads. An arc can damage threads and create problems next time you need to remove the nut.

With this Type A system, engine running, ground the field post of generator. If it now charges the regulator side of the voltage regulator is bad. If still no charge, jumper Generator armature to regulator battery. If it now charges the cutout in regulator is bad. If it still does not charge you have bypassed the regulator and likely have a generator or wiring problem.
 
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