How to Bypass the Starter Relay?

In this blog, we’ll offer a thorough how-to on avoiding the starter relay. We will go over the function of the starter relay, how to bypass it, and how to recognize the warning signals of a malfunctioning starter relay.

What is a Starter Relay?

Starter Relay

A Starter Relay is an electromechanical switch that controls the flow of power to the starter motor. It consists of a coil, contacts, and a plunger. When the ignition key is turned to the start position, the coil is activated and the plunger is dragged into the coil. The connections close as a result, supplying the starter motor with electricity from the battery.

What does a Starter Relay do?

  • Amplification: The current used by your ignition switch is not very high. This signal is amplified by the starter relay, which then supplies the high current required to turn on the beginning motor.
  • Circuit Completion: Only when you turn the key will the relay, which functions as a switch, complete the circuit to the starter motor. This keeps unintentional engagement from happening and shields the electrical system from needless strain.
  • Protection: By preventing overheating and excessive current draw, the relay protects the starter motor. As a result, the starter motor and relay have longer lives.

How Starter Relay works?

  1. Turn the Key: The starter relay receives a tiny electrical signal from the ignition key when it is turned.
  2. Activation: This signal pulls a metal contact and completes the circuit to the starter motor by turning on the electromagnet inside the relay.
  3. Starter Power: The engine is started by the starter motor, which receives a high current from the battery.
  4. Release: When the engine starts, the magnetic in the relay relaxes and the ignition switch releases the signal, cutting off the starter motor’s circuit.

Signs of a Faulty Starter Relay

Several signs can indicate a faulty starter relay in a vehicle. These signs may include:

  • Intermittent Starting Problems: A failed starter relay may be the cause of the car’s intermittent starting issues, which include the engine occasionally failing to start when the ignition key is turned.
  • No Start Condition: When the ignition key is turned to the “start” position, a faulty starter relay may cause a total no-start condition, in which the engine does not crank at all.
  • Starter Motor Keeps Running: Occasionally, even after the engine has started, the starter motor may keep running due to a malfunctioning starter relay. This may result in harm to the vehicle’s flywheel or flexplate as well as the starter motor.
  • Electrical Problems: A malfunctioning starting relay may be the cause of electrical problems including dimming interior lighting or abnormal behavior from other electrical components when the car is trying to start.
  • Burnt Odor or Smoke: If smoke or a burnt smell is detected in the vicinity of the starter motor or relay, it may indicate that the starter relay is malfunctioning and causing overheating.

It is best to get the car examined by a trained mechanic if any of these symptoms are noticed so they can identify and fix the problem. Ignoring a malfunctioning starter relay can worsen the vehicle’s starting system and perhaps prevent the engine from starting at all.

How to bypass Starter Relay?

It is merely a stopgap measure to bypass the starting relay. Long-term driving of an automobile with a bypassed starter relay is not recommended.

To bypass the Starter Relay, you will need a screwdriver and a pair of jumper cables.

  1. Locate the starting relay. Under the hood, in the fuse box, is where it generally lives.
  2. The battery’s negative terminal should be detached from the battery cable.
  3. A jumper cable’s positive termination needs to be linked to one end of the cable.
  4. The other end of the jumper cable should be connected to the starter terminal on the starter relay.
  5. Attach the opposite end of the jumper cable to the battery terminal of the starter relay. This will cause a spark to be formed, which will ignite the starter motor.
  6. Once the engine starts, remove the jumper cable.

When to Replace the Starter Relay?

  • Engine fails to start: If the engine does not start after inserting the key into the ignition, the starting relay may be malfunctioning. Prior to concluding that the starter relay requires replacement, it is important to rule out other potential causes, such as a dead battery or a broken ignition switch.
  • Clicking sound: A starter relay problem may be present if you turn the ignition to the “start” position but the engine still doesn’t start despite the loud clicking sound. A clicking noise could indicate that the relay is not engaging properly.
  • Intermittent starting issues: Issues relating to sporadic starting: The cause of intermittent starting problems, where the engine starts and then stops, could be a malfunctioning starter relay. Inconsistent beginning behavior is a common indicator of a failed relay.
  • Electrical problems: A faulty starter relay may be the cause of additional electrical problems in your vehicle. In the event that you have issues such as flickering lights, sudden power outages, or other electrical abnormalities, take into consideration the starting relay as a possible culprit.
  • Age and wear: Starter relays have a limited lifespan, just like other parts. In the event that your car is older or has a high mileage, the starting relay may be approaching the end of its useful life. Under these conditions, replacing the relay beforehand as part of regular maintenance might be a smart idea.

And you can check out Ampheo Electronics to have a better understanding of Relay and more.


In conclusion, the starter relay is a vital part of an automobile’s electrical system. Power from it powers the starter motor, which turns on the engine and cranks it to start. If the starting relay isn’t working, the automobile won’t start.

FAQs about the Starter Relay

Q1: Why would I need to bypass the starter relay?

  • Emergency Situations: You can start your car by bypassing the relay if it fails and you become stranded.
  • Testing Objectives: During diagnostics, mechanics frequently avoid the relay.

Q2: Is it safe to bypass the starter relay?

It is safe to temporarily bypass the relay, but this is not a long-term fix. Change the malfunctioning relay as soon as you can.

Q3: What are the dangers of bypassing the starter relay?

There is a risk of electrical shorts, fires, and even explosions when the starter relay is bypassed. The starter motor and other electrical parts may also sustain harm from it.

Leave a Comment