Which statement is correct regarding wiper motor voltage when running vs off and protection?

• A. The voltage at low speed is higher than high speed
• B. Some wiper systems use an internal automatic resetting circuit breaker to protect the motor from overloads
• C. Both statements are true
• D. Neither statement is true

Answer: (B)

Wiper motor speed is controlled by how much voltage reaches the winding, or by using different windings. For a slower speed, a resistor or higher-resistance path reduces the voltage seen by the motor, so the winding actually receives less voltage. For a higher speed, that drop is reduced and the motor winding gets more voltage. So the statement that the voltage at low speed is higher than at high speed isn’t accurate.

Protection-wise, many wiper systems include an internal automatic resetting circuit breaker to guard the motor against overloads or stalling. If the motor overheats or is overloaded, the breaker trips and then automatically resets when cooled, preventing damage without user intervention. This protection feature is the part that makes that option true.