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Wells Vehicle Electronics' Relays are designed and manufactured to meet or exceed original equipment manufacturers' specifications for performance and durability. Multi-Purpose Relays are used to control electrical circuits for components on a vehicle that have a high amperage load such as headlights, fuel pumps and cooling fans. A malfunctioning or inoperative Multi-Purpose Relay will cause a component to not function or function intermittently. Depending on which circuit is affected, a failed Multi-Purpose Relay could cause a no-start condition, proper vehicle operation and impaired safety systems. When diagnosing a failed Multi-Purpose Relay the corresponding fuse should be checked as well as verification that the amperage draw of the component on the circuit is within factory specs.
Late-model vehicles have anywhere from 10 to 40 relays. Each relay controls vital functions such as fuel delivery, vehicle cooling systems and electrical charging, or controls accessories including lights, wipers and radios. A non-functioning relay will cause a function to remain in the 'off' or 'on' position, and the lack of thermal shutdown and over-voltage protection in solid-state relays shorten part life.
Above is a basic relay wiring diagram
Custom application specific integrated circuit provides accurate resettable thermal shutdown and overvoltage protection to guard against abnormal conditions.
Relays that operate motors typically have diodes which provide circuit protection. Light, radio and auxiliary relays may or may not have resistors and diodes. For proper performance, select the correct relay for the application.
When replacing a relay, locate the OE number and specifications on the non-functioning relay. Many OEs label relays as 'miscellaneous' making it difficult to identify the correct replacement.
Before replacing any relay, visually inspect the entire electrical circuit including the component, relays, connectors and wiring in the circuit. Look for heat damage and damaged wires.