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Schumacher SC1340 - User Manual

Schumacher SC1340
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0099001947-00
PLEASE SAVE THIS OWNERS MANUAL AND READ BEFORE EACH USE.
This manual will explain how to use the battery charger safely and effectively.
Please read and follow these instructions and precautions carefully.
POR FAVOR CONSERVE ESTE MANUAL DEL USUARIO Y LEALO ANTES
DE CADA USO. En este manual le explica cómo utilizar el cargador de batería
de manera segura y conable. Por favor, lea y siga las siguientes instrucciones
y precauciones.
GARDER LE MANUEL D’INSTRUCTION ET LISEZ LE AVANT CHAQUE
UTILISATION. Ce manuel explique comment utiliser le chargeur de batterie
d’une façon securitaire et efcace. S’il vous plaît lisez et suivez ces instructions
et precautions.
MODEL / MODELO / MODÈLE :
SC1340
Automatic Battery Charger
Cargador de baterías automático
Chargeur de batterie automatique
OWNERS MANUAL / MANUAL DEL USUARIO
MANUEL D’UTILISATION

Table of Contents

Questions and Answers

  • C
    Carla DanielsAug 3, 2025
    What to do if the LED on my Schumacher Battery Charger doesn't light up when properly connected?
    • R
      Rebekah DavidsonAug 3, 2025
      If the LED on your Schumacher Battery Charger fails to illuminate despite proper connection, the issue might stem from a dead AC outlet or a poor electrical connection. Check the AC outlet for an open fuse or tripped circuit breaker. Also, inspect the power cord and any extension cords for loose plugs. Check for open fuse or circuit breaker supplying AC outlet. Check power cord and extension cord for loose fitting plug.
  • S
    shawnavilaAug 9, 2025
    What should I do if the LED on my Schumacher SC1340 never lights up, even when the battery is properly connected?
    • M
      Melissa ParkerAug 9, 2025
      If the LED on your Schumacher Battery Charger remains unlit despite a proper battery connection, it could be due to low battery voltage. Press the START/STOP button to initiate charging. Press the START/STOP button to start charging.
  • E
    Eric ShepardAug 22, 2025
    Why don't the battery clamps spark when touched together on my Schumacher SC1340?
    • K
      Kim MooreAug 22, 2025
      The battery clamps on your Schumacher Battery Charger will not spark when touched together if the START/STOP button has not been pressed. Press the START/STOP button. Press the START/STOP button.
  • T
    Tara MooreOct 27, 2025
    Why is the Bad Battery LED on my Schumacher SC1340 lit?
    • D
      Derrick BeckOct 27, 2025
      The Bad Battery LED on your Schumacher Battery Charger may light up due to several reasons: if the battery voltage remains below 10V after 2 hours of charging, if in maintain mode the output current exceeds 1.5A for 12 hours, if desulfation fails, or if the battery voltage drops below 12.2V in Maintain Mode. To address this, ensure there are no loads on the battery; if present, remove them. If the issue persists, have the battery checked or replaced. To reset the charger, unplug it from the AC outlet, wait briefly, and then plug it back in. The battery may be defective. Have battery checked or replaced. The battery won’t hold a charge. May be caused by a drain on the battery or the battery could be bad. Make sure there are no loads on the battery. If there are remove them. If there are non...
  • M
    Megan ChristensenNov 15, 2025
    What to do if the Schumacher Battery Charger has a short start cycle?
    • J
      jennamillerNov 15, 2025
      If you experience a short or no start cycle when cranking the engine with the Schumacher Battery Charger, several factors could be at play. First, ensure there's power at the receptacle and that both the AC cord and any extension cords are securely connected. Also, check for a good connection at the battery and frame. Allow 3 minutes of rest time between cranks to let the battery and charger cool down. For a severely discharged battery, consider using the 10A Boost setting for a few minutes to aid cranking. Be aware that crank time can vary with the amount of current drawn; if cranking draws more than the Engine Start Rate, crank time may be less than 3 seconds. If the charger overheats, ensure the vents are unblocked, wait, and then try again. Check for open fuse or circuit breaker supply...

Summary

Important Safety Instructions

Personal Safety Precautions

DC Connection Precautions

Follow These Steps When Battery Is Installed in Vehicle

Negative-Grounded Vehicle Connection

Connect positive clip to battery, negative clip to chassis away from battery.

Positive-Grounded Vehicle Connection

Connect negative clip to battery, positive clip to chassis away from battery.

Follow These Steps When Battery Is Outside Vehicle

Attach 6-Gauge Cable to Negative Post

Connect Positive Charger Clip

Grounding and AC Power Cord Connections

Grounded Plug Requirement

Charger requires a grounded 120V outlet for safety and to reduce electric shock risk.

AC Cord;Plug Alteration Warning

Do not alter AC cord/plug; use a qualified electrician for outlet issues.

Using an Extension Cord

Guidelines for using an extension cord, including wire size requirements.

Control Panel

LED Indicators

Explanation of Power, Charge/Boost, Charged/Maintaining, Clamps Reversed, Bad Battery LEDs.

Operating Instructions

Charging a Battery in the Vehicle

Steps for charging a battery while it is installed in a vehicle.

Charging a Battery Outside of the Vehicle

Steps for charging a battery when it is removed from the vehicle.

Rate Selection Button

Aborted Charge

Desulfation Mode

Maintain Mode

Using the Engine Start Feature

Instructions for using the charger to jump-start a vehicle's engine.

Troubleshooting

Battery Clamps Do Not Spark

LED Does Not Light

Short or No Start Cycle

ON LED Never Lit

ON and Bad Battery LEDs Lit

Bad Battery LED is Lit

Troubleshooting for Bad Battery LED, including voltage checks and desulfation failure.

Specifications

Schumacher SC1340 Specifications

General IconGeneral
Voltage12V
TypeAutomatic
Product TypeBattery Charger/Maintainer
Amperage40A
Battery Types SupportedAGM, Gel, Deep-Cycle
FeaturesReverse hook-up protection
Engine Start AssistYes

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