Replacement Exciter Carbon Brush

Restore Your Welder's Power

If your engine drive welder is struggling to hold an arc, losing power, or failing to generate auxiliary power for your tools, the culprit might be a small, inexpensive part: the exciter brush. These carbon brushes are the lifeline of your generator, transferring the electricity needed to create the magnetic field that powers your welding leads. When they wear down—and they will, it's just a matter of time—your machine's performance drops off a cliff.

This replacement exciter brush (402788) is designed to get your machine back up and running smoothly. Don't let a $10 part cost you a $1000 job. Worn brushes can cause erratic arcs that make laying a good bead impossible, and if left too long, they can damage the expensive internal components of your generator. Swapping them out is a standard maintenance task that can usually be done in the field or shop with basic tools.

Signs you need to replace your brushes:

• Welding output is weak or fluctuating.
• Auxiliary power outlets are dead or have low voltage.
• You see excessive sparking inside the generator housing.
• The brushes are worn down close to the holder.

Keep your rig reliable and your arc smooth. Always check your machine's manual to confirm part compatibility, but when it's time for a tune-up, fresh brushes are often the first step to restoring full power.