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intermittant reverse contactor?
either tips are just worn not connecting good every time or the contactor itself is dirty or worn out.
ok good to know. I pulled the traction motor head and cleaned everything and made sure I had good connections. After reinstalling I had no more sparking. I do however still have intermittent reverse. every now and then the reverse contactor will not kick in all the way. after you let off the twist grip and try again sometimes it will work and other times it will take a few times.
if you did change the brushes did you use a seating stone to seat the brushes to the armature? If you do not then yes you may get sparking because the brushes are not seated flat on the armature, plus if the armature surface is dirty or carboned over it can cause excess sparking.
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