When you purchase products through our links, we may get a commission. Learn more.

Schumacher Battery Charger Not Working? – Causes and Solutions

Schumacher produces one of the best automotive electrical products in history. They have been over fifty years in the business.

Nonetheless, countless times even the best products develop glitches or need some form of troubleshooting to function or maximally operate.

This resource discusses troubleshooting and fixing glitches with your Schumacher Battery Charger.

First, make sure your battery is still good

Often, we are quick to assume that the problem is the battery charger when the fault lies with the battery. So, do not waste your time and diagnostic effort; we advise you to check your battery’s state to ensure it is still good.

Don’t know how to go about this? It’s actually quite simple.

  • First, use a voltmeter to check your battery’s voltage. A voltage between 12.4 and 12.7 volts means your battery is in good shape. A voltage far lower than 12.4 volts means your battery is bad and needs replacement.
  • Next, check for leakages, corrosion, and any form of damages to your battery. If you find any, the odds exist that you have a bad battery.

Schumacher battery charger problems and How to fix them

In this section of the article, we will run you through likely problems with your battery charger and how to fix them. Pay rapt attention; we have also ensured you can easily find your way around fixing any of the problems you discover. Let’s get to it!

Your Schumacher charger is incompatible with the battery

The common problem is that your charger fails to recognize your battery. First, you must ensure you have the appropriate charger for the battery. If you have the correct charger, the problem lies with your battery and not your charger.

If your battery is depleted (less than 4 volts), the charger would probably not recognize/charge your battery. How do you fix this problem?

  • The way out is to contact support or ask your mechanic for alternate ways to charge your deeply discharged battery. If the volts of your battery pick up, the charger will recognize your battery.

Your Schumacher charger won’t turn on

Possible reasons why your charger won’t turn on could be because of a faulty main power regulator board. To be sure that this is the problem, check that all connections are appropriately in place, ensure connections are secure and be sure your battery is good.

If all this is in place, changing the main power regulator board is the way out of this mess. What do you do?

  • Contact support or ask an auto electrician who specializes in fixing battery chargers to change the primary power regulator of your Schumacher charger. 

Your Schumacher charger doesn’t charge the battery

This is a different kind of problem from the previous one. This time your indicator indicates that your charge is on, but your battery still doesn’t charge. Heave a sigh of relief; this is a common problem. Let’s fix it!

  • Start by jiggling and rocking your clips. Do this back and forth to ensure the connection is secure and appropriate.
  • If your battery still doesn’t charge, you should consider using the charger with another battery. You have a bad charge when the charger fails to charge another battery. If otherwise, then your battery is faulty.
  • The only way out of a bad battery charger is to replace your charger. Get shopping for a new one right away!

 Your Schumacher charger making a clicking sound

A clicking sound is another common problem you may encounter with a Schumacher charger. Usually, you hear a clicking noise when your charger is plugged into your battery. The solution is to let the noise be and allow the device to charge for up to 20 minutes. The noise should stop as long as the leads are connected to the correct poles.

If the noise persists, you are dealing with a faulty battery and not a bad Schumacher battery. How to fix this?

  • Buying a new battery is the solution when the clicking sound from your charger persists. Begin your hunt for a new battery, and test them out with your charger.

Your Schumacher charger shuts off on its own

A charger shutting off on its own is not always an indicator of a faulty charger. Schumacher charges have in-built protection to prevent overheating your battery and other damages. Usually, your charger would shut off on its own when there’s overheating.

How to fix this?

  • Unplug the charger for a beat for the temperature to drop. If this happens when the temperature is normal, you should unplug the charger and reverse connections.

Your Schumacher charger has a blinking yellow light

A yellow light indicator indicates that your battery is charging. When it turns green, it means that your battery is full, but a blinking yellow light means abort mode. In the abort mode, your battery stops charging and never reaches full charge.

How to fix a blinking yellow light?

  • Unplug the Schumacher charger and wait a bit, then re-plug the charger to get rid of the yellow light. If the blinking light persists despite this, try another charger or contact support.

How to use a Schumacher battery charger properly

Charging your battery would save you many common problems people encounter with their charger or batteries. We have extensively discussed the appropriate way to correctly use a Schumacher battery charge.

  1. Always charge your battery in a well-ventilated room. A poorly ventilated room would cause overheating and subsequently cause your charger to malfunction as well as damage the battery.
  2. Ensure that you can maintain the room temperature required for an excellent charge. When the temperature is too low or too high, problems with the Schumacher battery are inevitable.
  3. Use the correct charging mode for different battery types. To do this effectively, you must do extensive research about your battery technology and the best battery mode to use while charging them. This is particularly important when your battery doesn’t have sophisticated technology to prevent overcharging.
  4. Always use the correct voltage charger. Your battery or whatever electrical appliance has required voltage chargers need to charge them effectively. Usually, Schumacher can work with 6V and 12V.


Most of the challenges you may encounter with your Schumacher are common and easy to fix. If you find it difficult to fix, you should contact support or consider a replacement. Good luck! 

1 thought on “Schumacher Battery Charger Not Working? – Causes and Solutions”

  1. I have a 1.5 amp charger/maintainer from Schumacher on a snowmobile. It charged, then went to a blinking yellow light, indicating abort mode. I have another older Schumacher on another snowmobile that shows a power light on, and a green light showing it is charged.
    I have switched chargers to different snowmobiles and the new charger does the same blinking yellow on the other machine. Both batteries in the sleds test perfect.
    In my opinion it has to be the charger. Tell me I’m wrong.

Leave a Comment

Your email address will not be published.