How to Replace an Intermittent Wiper Relay Step by Step Guide
Apr 14, 2026Intermittent windshield wipers that stop working, behave unpredictably, or fail to activate at certain speeds are often caused by a faulty wiper relay.
For Auto Repair Shops, Distributors & Fleet Buyers
If you are sourcing reliable windshield wiper blades for resale or service use, we supply OEM and wholesale wiper blades with stable quality and global compatibility.
This guide explains how to replace an intermittent wiper relay, common symptoms to watch for, and what to check after installation.
What Is an Intermittent Wiper Relay?
The intermittent wiper relay controls the timing and activation of your windshield wipers, ensuring consistent interval operation.
The relay functions as a switch controlling low, high, and intermittent speeds. In the case of your windshield wipers, it energizes the correct circuit depending on the wiper switch setting.
Common Symptoms of a Faulty Wiper Relay
Wipers only work at high speed
Intermittent mode does not respond
Wipers stop mid-cycle
Clicking sound without blade movement
If these symptoms persist and the fuse is intact, relay replacement is recommended.
Step-by-Step: How to Replace an Intermittent Wiper Relay
Step 1: Locate the Relay
Most wiper relays are located in the fuse or relay box under the dashboard or hood. Refer to the vehicle manual for exact positioning.
Step 2: Disconnect the Battery
For safety, disconnect the negative battery terminal before handling electrical components.
Step 3: Remove the Faulty Relay
Carefully pull out the old relay using your fingers or a relay puller.
Step 4: Install the New Relay
Insert the replacement relay firmly into the correct slot.
Step 5: Reconnect and Test
Reconnect the battery and test all wiper modes.
Professional Tip: Inspect Wiper Blades During Repair
Worn or hardened wiper blades often contribute to poor wiping performance and increased system load.
Improve wiping efficiency
Reduce motor strain
Extend system lifespan
Many professionals choose OEM or premium replacement wiper blades directly from a reliable manufacturer to ensure consistent quality and fit.
Choosing the Right Wiper Blades After Repair
Vehicle-specific or multi-fit compatibility
Rubber or silicone durability
Noise control and smooth wiping
Performance in different climates
For distributors and wholesalers, working with a professional wiper blade manufacturer with stable factory production capacity ensures consistent quality, reliable supply, and long-term cooperation.
OEM & Wholesale Wiper Blade Supply for Professionals
If you serve auto shops, distributors, or fleet customers, sourcing matters as much as installation.
OEM / ODM customization
Bulk and wholesale supply
Private label packaging
Stable lead times and quality control
Frequently Asked Questions
Can a bad relay damage wiper blades? Indirectly, yes.
Should wiper blades be replaced after repair? Recommended if worn.
Do manufacturers offer bulk supply? Yes, for distributors and fleets.
Final Thoughts
Replacing an intermittent wiper relay is a straightforward repair that restores proper wiper function. Pairing electrical fixes with high-quality windshield wiper blades ensures long-lasting results.
Looking for a Reliable Wiper Blade Manufacturer?
OEM & private label support, bulk/wholesale supply, stable factory capacity, and global aftermarket experience. 👉 Contact us to discuss your sourcing requirements.
