Intermittent windshield wipers that stop working, behave unpredictably, or fail to activate at certain speeds are often caused by a faulty wiper relay. Replacing the relay is a relatively simple process for technicians and experienced vehicle owners.
This guide explains how to replace an intermittent wiper relay, common symptoms to watch for, and what to check after installation. We also share practical sourcing tips for replacement wiper blades, especially for auto shops, distributors, and fleet operators.
The intermittent wiper relay controls the timing and activation of your windshield wipers, ensuring the blades move at consistent intervals when intermittent mode is selected.
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.
When the relay fails, wipers may:
Stop working entirely
Operate at random speeds
Fail to respond to intermittent settings
Replacing the relay often restores normal function quickly.
Before replacing the relay, confirm these common signs:
Wipers only work at high speed
The intermittent mode does not respond
Wipers stop mid-cycle
Clicking sound from the relay box without blade movement
If these symptoms persist and the fuse is intact, relay replacement is recommended.
Vehicle service manual
Screwdriver set
Replacement wiper relay (vehicle-specific)
Protective gloves
Tip: Always verify relay compatibility by VIN or OE reference before installation.
Most wiper relays are located in the fuse or relay box under the dashboard or hood. Refer to the vehicle manual for exact positioning.
For safety, disconnect the negative battery terminal before handling electrical components.
Carefully pull out the old relay using your fingers or a relay puller. Avoid damaging surrounding connectors.
Insert the replacement relay firmly into the correct slot. Ensure proper alignment.
Reconnect the battery and test all wiper modes, including intermittent, low, and high speed.
While diagnosing relay-related issues, technicians often find worn or hardened wiper blades contributing to poor wiping performance or abnormal load on the wiper system.
For auto repair shops and fleet operators, replacing worn blades at the same time can:
Improve wiping efficiency
Reduce motor strain
Increase overall system lifespan
Many professionals choose to source OEM or premium replacement wiper blades directly from a reliable manufacturer to ensure consistent quality and fit.
When selecting replacement wipers, consider:
Vehicle-specific or multi-fit compatibility
Rubber or silicone material durability
Noise control and smooth wiping
Performance in different climates
For distributors and wholesalers, working with a factory-direct wiper blade supplier offers advantages such as stable production capacity, consistent specifications, and bulk order flexibility.
If you serve auto shops, distributors, or fleet customers, sourcing matters as much as installation. A professional windshield wiper blade factory can support:
OEM / ODM customization
Bulk and wholesale supply
Private label packaging
Stable lead times and quality control
Choosing the right manufacturing partner helps reduce return rates and improve long-term customer satisfaction.
Can a bad relay damage wiper blades? Indirectly, yes. Irregular power delivery can cause uneven wiping or excessive wear over time.
Should wiper blades be replaced after electrical repairs? If blades show signs of wear, replacing them during service is recommended for optimal performance.
Do manufacturers offer bulk supplies for auto shops? Yes. Many factories provide wholesale wiper blades for distributors, garages, and fleet maintenance programs.
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.
OEM & private label support, bulk/wholesale supply, stable factory capacity, and global aftermarket experience. 👉 Contact us to discuss your sourcing requirements.
