Generac Generator Green Light Not On [How to Fix]

Generac generators are renowned for their reliability and performance. However, like all machinery, they can encounter issues, one of which is the absence of the crucial green light indication. 

This light signifies that the generator is operating correctly, so when it’s not illuminated, it can cause concern. 

This article outlines the five common reasons why your Generac generator’s green light might not be on, and it offers potential solutions to rectify the issue.

Generac Generator Green Light Not On

Generac Generator Green Light Not On

1. Faulty Control Board

The control board for the Generac generator is the heart of the system, managing the generator’s operation.

 If the green light is not on, it could be an indicator that the control board is faulty. This could be attributed to a variety of issues, such as natural wear and tear, a power surge, or even a manufacturing defect.

It is critical to understand that the control board is responsible for managing the generator’s operation.

 A non-functioning control board could lead to a complete system outage.


A faulty control board will need to be replaced. This is not a DIY job and requires a certified Generac technician.

 They can correctly diagnose the issue, source the right replacement parts, and install the new control board without voiding the warranty.

2 . Incorrect Battery Connection

The green light indicator on your Generac generator might not be on due to an incorrect battery connection

This could be a result of improper installation or a loose connection that happened over time.

 The battery is crucial for starting the generator, and an incorrect connection can disrupt the flow of electricity, causing the indicator light to remain off.


A solution to an incorrect battery connection is to check and rectify the battery connections

Start by turning off the generator and disconnecting it from its power source. Inspect the battery for any loose connections or corrosion. If you find a loose connection, tighten it.

 If you notice corrosion, remove it using a wire brush and battery cleaner. After rectifying, reconnect the battery and start the generator. 

If the green light comes on, the issue is indeed an incorrect battery connection. However, if you’re unsure or uncomfortable doing this, hire a professional to ensure it’s done correctly and safely.

3 . Tripped Circuit Breaker

A tripped circuit breaker could be the root of the problem if the green light on your Generac generator is not on.

 Circuit breakers are designed to protect your generator’s electrical system by tripping or shutting off the power flow when they detect an overload or short circuit.

 Over time, circuit breakers can wear out, causing them to trip more frequently and leading to issues like the generator’s green light not illuminating.

Remember, frequent tripping of the circuit breaker is an indication of an underlying electrical issue. Ignoring this could lead to severe generator damage.


If a tripped circuit breaker is the cause, resetting it can solve the issue. First, ensure the generator is off and disconnected from its power source.

 Locate the circuit breaker and check if it’s in the ‘off’ or ‘tripped’ position. If it is, switch it back to ‘on’. Start the generator, and if the green light comes on, a tripped circuit breaker is the issue. 

However, if the circuit breaker keeps tripping regularly, this could signify a more serious issue that needs professional attention.

Always handle electrical components with care and consider hiring a qualified technician if you’re uncomfortable dealing with electrical systems. 

4 . Depleted Fuel Supply

A common reason for the green light on your Generac generator not being on could be due to a depleted fuel supply

Generators need a steady supply of fuel to operate correctly, and if the fuel tank is empty, the generator will not function. 

This can result from a lack of regular checks on the fuel level, a leak in the tank, or simply an extended period of operation without refilling the tank.


The solution to a depleted fuel supply is straightforward – refill the fuel tank. Start by switching off the generator and locating the fuel tank. 

Check the fuel level, and if it’s low or empty, refill it according to the generator’s specifications. 

Ensure that you’re using the correct type of fuel for your specific generator model. 

Once the tank is refilled, restart the generator. If the green light comes on, the issue was indeed a depleted fuel supply.

Please note, that regularly checking your generator’s fuel level can help prevent this issue from arising again in the future.

However, if you notice a fuel leak or the fuel depletes unusually quickly, it’s best to seek professional help as these could indicate more serious problems.

5 . Failed Starter Motor

The failure of the starter motor can also be a reason why the green light on your Generac generator is not on. The starter motor is crucial as it sets the engine in motion during the start-up phase. 

If this component fails, the generator will not start, resulting in the absence of the green light indicator. 

Common causes of a failed starter motor can include a worn-out motor, a damaged pinion gear, or a faulty electrical connection.


Fixing a failed starter motor typically involves replacing the faulty component. This task can be quite complex and should generally be undertaken by a certified Generac technician to prevent further damage.

 Following the replacement, if the green light comes on, the problem was indeed a failed starter motor.

 To prevent future failures, regular maintenance checks are recommended to ensure the starter motor and other generator components are in good working condition


In conclusion, a non-illuminating green light on your Generac generator could stem from varied issues such as a faulty control board, incorrect battery connections, a tripped circuit breaker, a depleted fuel supply, or a failed starter motor.

While some solutions, like rectifying battery connections or refilling the fuel tank, can be relatively simple to execute, others, like replacing the control board or starter motor, demand professional assistance to ensure safe and correct execution. 

Regular maintenance and prompt attention to any irregularities can help prevent these issues and extend your generator’s lifespan. 

Remember, when in doubt, always consult with a certified Generac technician to protect your investment and ensure reliable operation.


How often should I check my Generac generator’s battery connection?

It’s recommended to check your generator’s battery connections monthly to prevent any loose connections or corrosion.

What could cause my Generac generator’s circuit breaker to trip frequently?

Frequent tripping of the circuit breaker can indicate an underlying electrical issue that requires professional attention.

How regularly should I refill the fuel in my Generac generator?

Refill frequency depends on usage; however, it’s a good practice to check the fuel level before every use.

Can I replace the starter motor of my Generac generator by myself?

Replacing the starter motor can be complex; it’s generally advisable to hire a certified Generac technician for this task.

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