Wen 3500 Generator Section
Locate the vented cover to the left of the Muffler and remove the two screws holding the cover in place. The screws are either 7mm or 10mm, depending on the model.
Under the cover you will see the main components of the generator circuit. The Voltage Regulator is a rectangular box held in place with two 7mm screws.
The Brush Assembly is at the top with two individual wires attached to it. The Brush assembly is held in position with one 7mm screw.
The Wiring Bus connects the Stator to the Control Panel on the front.
Remove the Brush Assembly by loosening the 7mm screw.
Check the carbon on the Brushes for any broken ends or excessive wear. The brushes are spring-loaded and should bounce back out when you push the brushes into the housing. Brushes that are cracked, chipped or worn should be replaced. Brushes that stick in the housing and do not spring back out should be replaced.
The Brushes make connection with the Rotor by riding on the Slip Rings. With the Brush Assembly removed you should clean the slip rings of carbon build-up using rubbing alcohol and a rag or, in severe cases, emery cloth.
Reinstall the Brush Assembly by aligning it with the index post on the Housing and tightening the 7mm screw. It is normal for the Brush Assembly to be slightly tilted but the carbon should make good contact on the Slip Rings.
With the Brush Assembly in place you can test the exciter voltage by starting the Generator and reading the output to the brushes with a DC Voltmeter.
Typical exciter voltage readings are 10 to 12 Volts DC.
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