Brushes or Switch

Brushes or Switch

Power tool is running intermittently. One minute it’s working fine, just like it always did, and the next it’s completely dead. Click the trigger a few times and it’s running again. What’s going on?

While there are many problems that can cause intermittent power tool operation, the two most common failures are the switch and the brushes. You’re probably already familiar with these parts. The switch usually sits behind the main trigger, controlling power flow from the wall to the tool. The carbon brushes actually transfer power to the tool’s motor. It can be difficult to determine which failure you’re experiencing because both the brushes and the switch deal with electrical connections within the tool.

There are clues which can help you find the problem.

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