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to be sure it's the brushes and not something else.
With the engine idling, all the warning lights should be off. Have a helper watch the warning lights while you pull the thin red exciter wire off the alternator.
Lights should not change. Then ground the red wire and see which lights come on. The oil light should not. If it does, something else is going on.
If the oil light stays off, the problem is in the exciter circuit: Thin red wire...to... Brushes...to...slip rings...to...alternator frame...to...block ground circuit.
Regards,
Bob
:>)
PS When I got brushes only, from alloemparts, I think - I got three sets (have 3 240 drivers) just to make the shipping cost more effective.
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