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margaret40Jul 27, 2025
Why is the red LED lit on my Schumacher Electric Battery Charger?
- Aadam17Jul 28, 2025
The red LED being lit typically indicates reversed clamps. To resolve this, unplug the charger and reverse the clamps.
To Next PageTo Next PageWhy is the red LED lit on my Schumacher Electric Battery Charger?
The red LED being lit typically indicates reversed clamps. To resolve this, unplug the charger and reverse the clamps.
General| Brand | Schumacher Electric |
|---|---|
| Model | SC1278 |
| Category | Battery Charger |
| Language | English |
Manual contains important safety and operating instructions.
Using unapproved attachments can lead to fire, shock, or injury.
Do not use a charger with a damaged cord or plug; replace it immediately.
Damaged chargers should be taken to a qualified serviceman for repair.
Do not disassemble the charger; seek professional service for repairs to avoid hazards.
Unplug the charger before performing maintenance or cleaning to prevent electric shock.
Warning about explosive gases generated by lead-acid batteries during operation.
In case of acid contact, wash skin with soap and water; flush eyes and seek medical help immediately.
Do not smoke or create sparks near batteries or engines to prevent explosion.
Use charger only for specified 12V lead-acid batteries; do not use for dry-cell batteries.
Never attempt to charge a frozen battery, as it can cause damage or explosion.
Connect/disconnect DC clips only after unplugging the unit; prevent clips from touching.
Connect RED clip to POSITIVE post, BLACK clip to chassis/engine block for negative-grounded vehicles.
Connect BLACK clip to NEGATIVE post, RED clip to chassis/engine block for positive-grounded vehicles.
Disconnect charger by removing AC plug, then chassis clip, then battery terminal clip.
Warning about explosion risk from sparks near batteries and how to reduce it.
Disconnect charger in reverse sequence, breaking the first connection at a distance.
Use only with properly installed and grounded 120V outlets; ensure plug fit.
Never alter the AC cord/plug; use a qualified electrician for proper outlet installation to avoid shock.
Pulsing green LED indicates the charger is connected to AC power.
Solid green LED signifies that the battery is actively charging.
LED off means the battery is fully charged and the charger is in Maintain Mode.
Solid red LED indicates that the battery clamps are connected in reverse.
Do not start the vehicle while the charger is connected to AC power to prevent damage.
Detailed steps for charging a battery while it is installed in a vehicle.
