Technical How many brushes are grounded in a 4 brush starter motor?

Maybe @e1956v can assist?
I guessing 2, but don’t really know.

But I have one of the 4 brushes that may have had insulation on it, or not. This starter has slots in the housing to access the brushes. Then a band around the access slots, under the band is a rubber strip to keep moisture/ect out.
My rubber protector fell apart in pieces, and I can’t tell if what I saw on the brush wires was left of insulation or the rubber band around the holes.
I pulled this starter off of an engine that was in a fire, other than that one set of wires the rest of it looks like new.

Thanks

 

If it has a single power connection point, two should be grounded.

 

Thanks Steve, just ohmed it out and two opposite brush “cases” are ground to the starter.
Whew!

 

Sorry off line today
Steve as usual has the answer.