How to Test a Voltage Regulator on a Lawn Mower – Get Some Basic Knowledge

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You must know a lawnmower has a lot of parts to perform its function perfectly. The riding mower runs very similarly to a car. Do you understand well about voltage regulator?

No worries. In today’s article, I will be talking about How to Test a Voltage Regulator on a Lawn Mower. I will also the fact that when you might test the voltage regulator in this article.

While your mower is running, some amount of charge should reverse to the battery. The voltage regulator ensures this function. 

You are an experienced user or new owner of a mower.No matter; you must have a good understanding of every part of the lawnmower. A good deal is not enough; you should have checked the vital parts of the mower regularly. 

If you check the pulley, belt, and voltage regulator regularly, you can enlarge the lawn mower’s total lifetime and overall performance. 

Do you have any idea about the lawnmower charging system diagram? I am going to discuss all this matter in the next paragraph. 

A voltage regulator is a fundamental part of a lawnmower. I  can state this with full confidence because your battery may die if it doesn’t work accurately.

So you must remember how to examine the lawnmower. The amazing fact is that you can know whether your battery is working correctly on not by checking the voltage regulator. 

Without any impediment, let’s proceed to our main topic. 

What Is A Voltage Regulator?

So easy. The voltage regulator operates like the alternator when you compare it with a car. It ensures that the electric charge travels properly back to the battery when the lawnmower works.

What rescue your mower from overheating and being shorted? Surely the voltage regulator will save the mower, and a bad voltage regulator can harm your battery.

Even a small engine voltage regulator can stop your lawnmower from turning on. You may face substantial financial losses due to a defective voltage regulator. So I can recommend you test the voltage regulator regularly for your personal safety as well.

When Should You Examine The Voltage Regulator?

If you are a new owner, you may think that you should regularly test the regulator, but the fact is different. You don’t require to examine the voltage regulator so early. 

You should test it whenever it needs to be tested. But when you need to inquire about the voltage regulator? Okay, you have to try it if your battery consistently diminishes.

You may keep notice if there is any unexpected behavior in your battery. In case of any unexpected behavior, you must check the voltage regulator.
Your battery is good, but sometimes you end up with a dead battery? It is high time to analyze the voltage regulator.

Tools that You need:

1. A Multimeter 

You demand to check the energy of the battery utilizing a multimeter. It would help if you badly to get an idea about battery execution. You can buy a multimeter from various shops, but I can suggest of my own choice.

2. Electrical nonconductor hand gloves

You should ensure your safety first. You must wear insulation gloves to protect you from any accident. I always select the best glove at a low price. So follow my link here. 

How to Test a Lawnmower Voltage Regulator-Step by Step Process

Step 1: Adjust The Lawn Mower

Place your lawnmower on a plane surface.In this way, you may perceive it as more relaxed working with a lawnmower.But make sure that you are wearing hand gloves for safety purposes.

Step 2: Find out Lawn Mower Battery

Voltage regulator attached to the battery and so you need to locate the battery first.

Step 3: Set The Multimeter

When you find the battery, then apply the multimeter button. The voltage is recorded as V or ∆V on a multimeter.If you don’t understand this, you must use the user manual. Always remember you can not measure the voltage at ohms or ampere. If you apply the button at ohms or ampere, it may cause harm to your device.

Step 4: Attach Cables

You know there are two cables in a multimeter: a red cable and a black one. In the battery, there are two portions, positive and negative. Always join the black cable with the positive node and enter the red line with the negative node. You must remove the plastic node from the battery.

Step 5: Review The Multimeter

It is time to notice the multimeter display. 

  • Reading higher than 12 volts is a good sign. Its means that your battery is in excellent health.
  • If you notice that the reading is under 12, then it is a bad sign for you. Reading less than 12 is a manifestation of poor battery performance.
  • How can you recognize that your battery is lifeless? If your multimeter does not show any reading, then it is confirmed that your battery is dead.
  • One thing to remember is that you can not see any reading if the multimeter is not set accurately.

Step 6: Excite The Lawn Mower

All done. Now time for the check. Start your lawnmower and then compare the performance that is shown by the multimeter.

Some Important Facts

  • If you find the reading around 13.8 volts, that means your battery is working well.
  • In case the reading is over 14.5, that is the sign of any fault in the regulator. 
  • How can you understand that the battery is slowly fading? If you see the reading is below 13.8, that indicates that the battery is draining. You need to restore it with a new one.
  • Hold in mind that you must take all the reading when the power is on.


You must wear insulation hand gloves to protect you from any unwanted accident.  Before working on the multimeter, you should understand the user manual. You have to understand every process of working this multimeter because any faulty use can be dangerous.

Frequently Asked Question:

1.How do I know if my stator is lousy?

A lot of people ask how to test a lawnmower stator. After inserting the probe, if you see the reading around 0.2 to 0.5 ohms, that’s mean your stator is working well. If you notice an open circuit or infinity reading, then something may be wrong with this. It would help if you replaced it soon.

2.How do you monitor a lawnmower charging system?

OK, turn on the headlights. You can also check by turning on other outdoor power equipment. If your light dims after switching off the engine, then you can say that your alternator works.

3.What problems can a wrong voltage regulator cause?

A lousy regulator may cause many problems. It may harm the fuel pump, ignition system, and other vital parts.

4.What happens if the voltage regulator flops?

You know the alternator cycle the power from the battery. A lousy voltage can reduce the alternator’s ability. Also, a damaged battery can harm battery performance. 

Bottom Lines

The flow of the charge from the battery is interrupted by the damaged voltage regulator. So after few days, you need to check the voltage regulator as well as its performance. I hope this article will favor you a lot. Thank you for your interest and patience.

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