Sounds like field current is failing. Field rectifier may be going intermittent. Other possibility is bad connection on rotor field winding to slip rings or comnmuntator brushes connection. I am surprised there is an electrolytic cap as they don't like the heat that they would be exposed to inside a generator. Replace it first.
Okay I see. The schematic is partially wrong or at least drawn in a way that is schematically wrong. The exciter coils produce AC which is apparently center tapped with the center tap connected to the blue wire that goes to the one brush and the capacitor from there. The two diodes are on the outside ends of the exciter winding and go the diodes to complete the circuit.
Most likely there are several corroded connections that are causing the problems. The spade connectors look old and crusty on the capacitor. and the green ground wire that goes to the capacitor bracket looks like it could cause problems with a loose and dirty connection there as well.
Come and go electrical issues are most often caused by dirty, corroded or loose connections. I would recommend a good physical cleaning and possible replacement of the spade connectors on the capacitor and the capacitor bracket and point of attachment to the end bell body. also cleaning the end bell body to stator contact points.
Contact cleaners are no substitution for a physical cleaning. They are a good wash down afterwords.
I run across people all the time that try to fix bad battery and power connections just by spraying them with contact cleaner. It never works for long if at all.
Physically cleaning the connection to the point of getting down to good metal works and then making sure that there is a firm physical contact between the different parts does work!
There could be corrosion at the wire to terminal joints if they are just crimped on. Run into that enough times.
Hi,
I think that this flashing you speak of,
is restoring some of the residual magnetism.
If this is your intention then i suggest you remove
the capacitor connections and the diode connections
while you do this, as this is quite aggressive electrically.
And make sure you have it the right way round.
Best of luck with it,
John
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