Mercury Generator

[RalphG]

I pulled this Mercury generator out of the spare parts bin today and was surprised to see it rated as "7 volts". its an exact match to the one on my 52 but my tag was damaged and not able to read the output rating.
Mine on the Merc still works fine but I notice the little grooves in the commutator are worn nearly smooth and now wondering what shape the brushes are in. I don't want to pull it apart when its still working ok but might consider fixing up this spare one to have on hand in case its needed.