* Wiring Issues: This is the most common culprit. Even with a new motor, incorrect wiring, loose connections, or a faulty wire can prevent it from functioning. Check all connections at the motor, the fuse box, and any relays involved in the wiper circuit. Look for broken or corroded wires.
* Fuse: A blown fuse will prevent power from reaching the wiper motor. Check the fuse box for a blown fuse related to the wipers (consult your car's manual). Replace it with one of the correct amperage.
* Relay: The wiper motor might be controlled by a relay. A faulty relay will prevent the motor from receiving power. Test the relay with a multimeter or replace it.
* Switch: The wiper switch itself could be faulty, preventing the signal from reaching the motor. Try testing the switch continuity with a multimeter.
* Grounding Problems: A poor ground connection can prevent the motor from receiving the necessary electrical current. Inspect the ground wire and ensure it's securely connected to a clean metal surface.
* Incorrect Motor Installation: It's possible the new wiper motor wasn't installed correctly. Double-check the installation process against the instructions or a repair manual. Make sure the linkage is properly connected and moving freely.
* Wiper Linkage: Even with a new motor, problems with the wiper linkage (arms, pivots, etc.) can prevent the wipers from moving. Check for any binding, broken parts, or misalignment.
* Incorrect Motor: Though less likely, ensure you bought and installed the correct motor for your specific car model and year.
* Multi-Function Switch (if applicable): Some vehicles use a multi-function switch that controls wipers, turn signals, and other functions. A problem in this switch could affect the wipers.
Troubleshooting Steps:
1. Check the fuses: This is the easiest and first thing to do.
2. Inspect all wiring connections: Look for corrosion, breaks, or loose connections.
3. Test the relay: If applicable, test or replace the relay.
4. Check the wiper switch: Test its continuity or replace it if necessary.
5. Inspect the ground connection: Ensure it's clean and secure.
6. Examine the wiper linkage: Check for any binding or broken parts.
7. Verify correct motor installation: Re-check the installation instructions.
If you're not comfortable working with car electrical systems, it's best to take your vehicle to a qualified mechanic. Attempting repairs without proper knowledge could cause further damage.
