Posted by rvirgil_KS on December 08, 2018 at 13:27:42 from (50.93.231.212):
In Reply to: Farmall 400 no charge posted by Joebanana on December 08, 2018 at 11:58:20:
Do a search for Bob M Farmall Diagrams
Since it is positive ground I assume it is a generator with external regulator and not a alternator
If gauge rested in the center at 0 it is an amp gauge not a volt gauge. If battery is well charged and engine starts good the amp gauge will not show much movement.
Gauge all the way left could just be a stuck needle. Take the handle of a screwdriver and gently tap the gauge and see if it will free it. If not will need to replace the gauge. If it starts and lights work the gauge is not cause of no charge.
Check voltage at battery. Should be about 12.6 volts at rest and 13 to 14 running at half throttle or more.
If voltage does not rise when running, ground the Field post on generator. If it now charges you have a bad regulator side in the voltage regulator. If it still does not charge leave field grounded and jumper from generator armature or armature tab on regulator to BAT on regulator. If it now charges you have a bad cut out side in the regulator. If still no charge check for generator or wiring problem.
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