Schumacher Electric SC1402 User Manual (English)

Questions and Answers:

N
nguyenleslieAug 5, 2025
What to do if my Schumacher Electric SC1402 Automobile Battery Charger won't turn on?
- C
  Charlene HarperAug 5, 2025
  If your Schumacher Electric Automobile Battery Charger isn't turning on despite being properly connected, the issue could stem from a dead AC outlet, a poor electrical connection, or a defective battery. First, check the AC outlet's fuse or circuit breaker. Next, inspect the power cord and any extension cords for loose connections. Finally, have the battery professionally checked to determine its condition.
M
Megan MillerAug 14, 2025
What to do if the red LED is lit on my Schumacher Electric SC1402 Automobile Battery Charger?
- J
  johnhamiltonAug 14, 2025
  If the red LED is lit on your Schumacher Electric Automobile Battery Charger, it indicates a problem with the battery. This could mean the battery voltage is below 10V after 2 hours of charging, or in maintain mode, the output current is more than 1.5A for 12 hours, or desulfation was unsuccessful. The battery may be defective, overheated, too large, have a short circuit, or be too old. Make sure there are no loads on the battery. If the issue persists, have the battery checked or replaced.
A
Alice ThomasAug 25, 2025
Why doesn't the engine start function work on my Schumacher Electric SC1402?
- N
  nicolebrockAug 25, 2025
  The engine start function on your Schumacher Electric Automobile Battery Charger may not work for several reasons. You might be drawing more than 150 amps, or you may not be waiting the full 3 minutes (180 seconds) between cranking attempts. Also, the charger could be overheating, or the battery may be severely discharged. * If cranking draws more than 150 amps, reduce crank time. * Ensure the Engine Start LED is not blinking; wait 3 minutes before the next crank. * Check that the charger vents are unblocked. * For a severely discharged battery, use the 20A Boost rate for 10-15 minutes before attempting to start the engine.

Schumacher Electric SC1402 Specifications

General

Input Voltage	120V AC
Output Voltage	6V/12V
Battery Type Compatibility	Standard, AGM, Gel, Deep-Cycle
Microprocessor Controlled	Yes
Automatic Voltage Detection	Yes
Reverse Hook-Up Protection	Yes
Type	Battery Charger
Charge Rate	2A
Charging Modes	Engine Start
Display Type	LED
Cable Length	6 ft

Summary

Safety Instructions and Precautions

Explosive Gas Hazard Warning

Warning about explosive gases generated by lead-acid batteries during normal operation.

Preventing Sparks and Accidental Shorts

Avoid sparks near batteries. Be cautious of dropping tools to prevent shorts.

Handling Battery Acid and Personal Protection

Keep water/soap nearby. Wear protective gear. Wash acid off skin immediately.

Battery Type and Charging Restrictions

Use only lead-acid batteries (22-59Ah). Never charge a frozen battery.

Preparing to Charge

Battery Preparation Steps

Remove battery if needed, ensure ventilation, clean terminals, check water levels.

Consulting Manufacturer Guidelines

Study battery manufacturer's precautions and rates. Set charger voltage and charge rate correctly.

Charger Location and Setup

Optimal Placement and Ventilation

Locate charger away from battery, avoid direct placement above, and ensure ventilation.

Safe Connection and Disconnection

Disconnect AC power before connecting/disconnecting clips. Ensure clips do not touch each other.

Connecting Battery in Vehicle

Cable Routing and Component Clearance

Position AC/DC cords away from moving engine parts to prevent damage.

Identifying Battery Polarity and Grounding

Check battery post polarity and determine which post is grounded to the chassis.

Connecting to Negative Grounded Vehicle

Connect RED clip to POSITIVE post, BLACK clip to chassis or engine block away from battery.

Connecting to Positive Grounded Vehicle

Connect BLACK clip to NEGATIVE post, RED clip to chassis or engine block away from battery.

Connecting Battery Outside Vehicle

Battery Polarity and Cable Connection

Check polarity. Attach 24-inch insulated cable to NEGATIVE post, connect RED clip to POSITIVE post.

Final Connection and Disconnection Procedure

Make final connection, then disconnect in reverse sequence, breaking first connection away from battery.

Grounding and Extension Cord Usage

Grounding Requirements for Safety

Charger must be grounded to reduce shock risk. Use properly installed and grounded outlets.

Extension Cord Guidelines

Use appropriate gauge and condition extension cords if necessary, matching charger plug.

Assembly Instructions

Attaching Wheels and Feet

Attach the feet to the charger base using the provided screws.

Extending the Handle

Pull the handle upward until it locks into place; press silver buttons inward if needed.

Control Panel Overview

ON/OFF Switch Functions

Selects between OFF, Charge/Maintain, Boost, and Engine Start modes.

Rate Selection Button

Chooses between 6<>2A Charge/Maintain and 20A Boost settings.

LED Indicator Lights

Displays status: reversed clamps, bad battery, charging, or charged/maintaining.

Operating Instructions

Charging a Battery in the Vehicle

Steps for charging a battery while it remains installed in the vehicle.

Charging a Battery Outside the Vehicle

Steps for charging a battery that has been removed from the vehicle.

Using the Engine Start Feature

Engine Start Procedure

Steps for using the 150A engine start feature to jump-start a vehicle.

Engine Start Warnings and Notes

Avoid using without a battery; follow cooldown periods and retry intervals.

Automatic Charging Modes

Battery Charging Times

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

Aborted Charge and Desulfation

Information on charging aborts, desulfation mode, and the BAD BATTERY LED.

Charge Completion and Maintain Mode

Indication of charge completion and how maintain mode keeps batteries fully charged.

Maintenance and Troubleshooting

Charger Maintenance

Basic cleaning and care for clamps and charger case to ensure longevity.

Troubleshooting Common Problems

Solutions for issues like charger not turning on or engine start not working.

Troubleshooting Specific Issues

Red LED Indicator Issues

Diagnosing problems indicated by the red LED, such as battery defects or overheating.

Battery Voltage Drop Issues

Addressing issues where battery voltage drops in maintain mode or fails to hold charge.

Repair and Specifications

Returning Unit for Repair

Contact customer service for troubleshooting assistance and RMA number before shipping.

Technical Specifications

Details on input voltage, current, and output voltage/current ratings.

Limited Warranty Information

Warranty Coverage and Duration

Three-year limited warranty against defective material or workmanship.

Warranty Exclusions and Limitations

Covers misuse, unauthorized repair, and disclaims implied warranties and consequential damages.

Warranty Registration

Online Warranty Activation

Mail-in Warranty Card

Instructions for filling out and mailing the warranty card if online registration is not possible.

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Schumacher Electric SC1402 User Manual

Table of Contents