What should the voltage be on a fan motor?

Check the schematic–a few vehicles switch from the ground side of the fan motor, not the high side. If so, there should be 12 volts to the motor full-time, regardless of the switch position, and you’ll need to check voltage on the ground side. If you have no juice to the motor, it’s time to find out why.

What causes a car fan to stop turning?

Okay, not every fan motor dies in such a spectacular blaze of glory. The lives of these devices are unpredictable. Sometimes the motors just keep zipping along and lose steam gradually–until they just don’t turn anymore. Or the fan may croak on the spot without warning. That’s usually an indication of seized bearings.

What happens when a motor on a fan dies?

A fan constantly turning full-chat is noisy, and unnecessary a lot of the time. So most fan blower switches use a voltage-dropping resistor assembly to slow down that motor to a quieter speed. When this resistor dies, the fan will no longer work at certain speeds.

How can I tell if my car fan motor is broken?

Get out the meter, or at least a test light. It’s time to chase voltages. Twist the ignition key to accessory (ACC) mode and turn the fan switch to high. Back-probe the hot line into the fan, and you should see 12 volts in the system.

How does a ceiling fan in a motor home work?

Ceiling fan mode circulates air when vent is closed. This roof vent uses a 12-volt fan to circulate air in motor homes and enclosed trailers, keeping interiors ventilated without compromising security. Wedge-shaped, white plastic vent cover opens and closes with a hand-operated crank.

What are the parts of a bathroom exhaust fan?

Bathroom Exhaust Fans Bathroom Fan Parts Part/Accessory Type Upgrade Kit (15) Bath Fan Grill (11) Filter (3) Motor (3) Mounting Kit (2) Duct Adapter (1) Fan Knob (1) Replacement Lens (1) + See All Brand Broan-NuTone (25) Panasonic

How does the maxxfan deluxe roof vent work?

MaxxFan Deluxe Roof Vent w/ 12V Fan, Thermostat, and Remote – Powered Lift – 10 Speed – White The built-in rain shield on this powered roof vent protects the interior of your RV or camper from rainwater. The reversible, 10-speed fan has a thermostat to regulate airflow inside your RV. Ceiling fan mode circulates air when vent is closed.

What kind of fan does a motor home roof cover use?

Flat, low-profile metal vent cover opens and closes from inside with a hand-operated crank. This roof vent uses a 12-volt fan to circulate air in motor homes and enclosed trailers, keeping interiors ventilated without compromising security.