V23136-L31-D642 | Genuine TE Connectivity® Automotive Power Relay

1. Controls High-Current Loads

Allows low-current circuits to switch on/off components that draw high power, such as:

• Fuel pumps

• Cooling fans

• Headlights

• Horns

• A/C compressors

• Radiator fans

2. Protects Control Systems

Prevents delicate switches and electronic modules (ECU, BCM, etc.) from carrying heavy electrical loads that could damage them.

3. Enhances Electrical Reliability

Provides stable and reliable switching for systems that require high current.

4. Allows Automation

Used by computerized vehicle systems to automatically activate components as needed (e.g., fan kicks on at certain engine temp).

If the relay controls a device (fuel pump, cooling fan, headlights, A/C compressor), that component may fail to activate.

2. Intermittent Operation

The component may:

• Work sometimes

• Cut out randomly

• Turn on/off by itself
  This often indicates worn or sticking relay contacts.

3. Clicking Sound from the Relay

• A faint click is normal when a relay switches.

• Rapid clicking or no clicking at all when activated can indicate a failing relay or bad coil.

4. Electrical System Malfunctions

Examples:

• Engine won’t start (if it’s the starter or fuel pump relay)

• A/C blows warm air (A/C clutch relay issue)

• Radiator fan doesn’t come on (fan relay issue)

5. Burnt Smell or Melted Relay Housing

Overload or overheating can damage the relay internally, causing:

• Burning smell

• Melted plastic

• Dark or burnt pins

6. Dead or Weak Coil

If the coil inside the relay is damaged, the relay won’t close the high-current circuit even though power is present.

7. Corroded or Burnt Pins

Dirty or oxidized relay terminals can cause poor contact and unreliable operation.

8. Blown Fuse (linked circuit)

A failing relay can cause electrical spikes or shorts that blow a fuse connected to that circuit.