Motomaster Classic Series

Joshua RamosNov 24, 2025

What to do if the Red LED is blinking on Motomaster Classic?

C
Cody NelsonNov 24, 2025
If the Red LED is blinking on your Motomaster Battery Charger, it could indicate several issues: * **The battery voltage is still below 10 V after 2 hours of charging:** The battery may be defective. Make sure there are no loads on the battery. If there are, remove them. If there are none, have the battery checked or replaced. * **In Maintain Mode, the output current exceeds its maintain level for 12 hours:** The battery may be defective. Have battery checked or replaced. * **Desulfation was unsuccessful:** The battery may be overheated. If so, allow the battery to cool. * **Lack of progress is detected and battery voltage is below 14 V:** The battery may be too large or have a short circuit. Have battery checked or replaced. * **The battery voltage drops to below 10.8 V in Main...

Voltage	12V
Input Voltage	120V AC
Output Voltage	12V DC
Type	Automatic
Output Current	2A
Battery Compatibility	12V Lead-Acid Batteries (AGM, Gel)
Charging Modes	Trickle charge
Safety Features	Reverse Polarity Protection, Overcharge Protection, Short Circuit Protection

Voltage

12V

Input Voltage

120V AC

Output Voltage

12V DC

Type

Automatic

Output Current

Battery Compatibility

12V Lead-Acid Batteries (AGM, Gel)

Charging Modes

Trickle charge

Safety Features

Reverse Polarity Protection, Overcharge Protection, Short Circuit Protection

Summary

Safety

Safety Information

General safety guidelines for using the battery charger and handling batteries.

Personal Safety Instructions

Precautions for personal protection when working with lead-acid batteries.

AC Electrical Connections

Information on connecting the charger to a power outlet and using extension cords.

Using an Extension Cord

Guidelines for using extension cords with the battery charger.

Preparing to Charge

Instructions on charger location and battery preparation before charging.

Assembly

Steps for assembling the battery charger, including handle extension.

Connecting Your Battery

Battery in Vehicle (Negative Grounded)

Instructions for connecting the charger to a negatively grounded battery in a vehicle.

Battery in Vehicle (Positive Grounded)

Instructions for connecting the charger to a positively grounded battery in a vehicle.

Battery Removed from Vehicle

Steps for connecting the charger to a battery that has been removed from the vehicle.

Know Your Charger

Start;Stop Button

Description of the button used to start and stop the charging process.

Rate Selection Button

Explanation of the button used to select charging rates (6A, 40A, 200A).

LED Indicators

Meaning of the different LED lights on the charger indicating status.

Operation

Charging Your Battery

Step-by-step guide on how to charge a battery using the charger.

Battery Charging Times

Table showing estimated charging times for different battery sizes and rates.

Aborted Charge

What happens when charging aborts and how to reset the charger.

Desulfation Mode

Explanation of the special mode for desulfating sulfated batteries.

Completion of Charge

How to identify when charging is complete and the charger enters maintain mode.

Maintain Mode (Float Mode Monitoring)

How the charger maintains a full charge and monitors battery status.

Maintaining a Battery

Information on safely charging and maintaining batteries over extended periods.

Power-Up Auto Start

How the charger automatically starts charging after power-up if no button is pressed.

Using the Engine Start Feature

Instructions and safety precautions for jump-starting a vehicle.

Engine Starting Notes

Details on the different states and timing during the engine start sequence.

Maintenance

Maintenance Procedures

Steps for cleaning clamps, charger case, and proper storage to maintain the charger.

Troubleshooting

Charger Not Turning On

Solutions for when the charger does not power on when connected.

Charging LED Not Lit

Troubleshooting steps when the battery is connected but the charging LED is off.

Engine Start Cycle Issues

Diagnosing problems with the engine start function and cranking.

Red LED Blinking

Causes and solutions when the red LED indicator blinks.

Motomaster Classic Series - User Manual

Table of Contents

Questions and Answers