Wiring Issue: A common cause of blown relays is a short circuit or damage to the wiring system. Inspect the wiring connected to the fan relay 1 for any damage, fraying, or loose connections. Ensure that the wiring is intact and properly connected.
Faulty Cooling Fan Motor: A defective cooling fan motor can draw excessive current, causing the relay to overheat and blow. To check the fan motor, disconnect it from the electrical system and rotate it freely by hand. If the motor feels stiff or resists rotation, it might be faulty and need replacement.
Improper Ground Connection: Poor grounding can lead to excessive current flow through the relay, causing it to blow. Ensure that the ground connection of the cooling fan system is clean and properly connected to a good grounding point on the chassis.
Relay Failure: The relay itself could be defective or have internal damage. A faulty relay may have burned contacts or internal components that have failed. To verify this, try swapping the relay with an identical one from another circuit (if available) and see if the issue persists.
Additional Load on the Circuit: Verify that there are no additional accessories or modifications connected to the cooling fan circuit that could introduce increased electrical load and strain the relay.
