When the charging cycle is complete, the instructions dictate a reverse order for disconnecting:
The Selmar Turbo 4 is capable of outputting 40-60 Amps (depending on the variant). Ignoring the manual can lead to battery explosions, acid burns, or fire.
Do not skip these instructions:
Safety begins with the connection process. The instructions for the Schumacher Turbo 4 emphasize a specific order of operations to prevent dangerous sparks or explosions from battery gases. selmarturbo4batterychargerinstructions link
1. Preparation and Safety: Before turning the unit on, ensure the vehicle is in park (or neutral for manuals) with the parking brake set. Turn off all accessories (lights, radio, AC). Inspect the battery for cracks or leaks; do not attempt to charge a damaged battery. If the battery is a standard (non-sealed) type, check the fluid levels.
2. Connecting the Cables: The Turbo 4 is designed for 12-volt negative-ground systems (the standard for almost all modern cars).
3. Setting the Charge Rate: Once connected, plug the charger into a standard 120V AC outlet. Turn the Timer knob to the desired time. For a deeply discharged battery, a longer duration at a lower amperage (10A) is often safer for battery health, while the 40A setting is useful for a quick "top-up." When the charging cycle is complete, the instructions
4. Monitoring the Process: The meter on the front face indicates the flow of current. When you first turn the unit on, the needle will jump to the selected amperage. As the battery charges, the needle will slowly drop back toward zero. If the meter does not register any activity, check your connections or consult the troubleshooting section of the manual.
The "Turbo" setting is why people search for the instruction link. Used improperly, it will fry your battery.
When to use Turbo Mode:
The Official Turbo Procedure (from the manual):
Warning: Leaving the charger in Turbo mode for 20+ minutes without a load will boil the battery dry.
Even with the official instructions, issues occur. Here is a cheat sheet based on the manual’s FAQ. Safety begins with the connection process
| Symptom | Probable Cause | Solution (per manual) | | :--- | :--- | :--- | | Unit hums but no amps | Blown rectifier diode or bad connection | Check clamps for copper breakage. Test with a multimeter. | | Ammeter pegs at 60A+ | Deeply sulfated battery or shorted cell | Stop charging. The battery is likely dead. | | Charger sparks when connecting | Connected while charger was "On" | Always follow: Plug after clamping. | | Turbo mode resets | Overheat protection engaged | Wait 15 minutes. The thermal breaker needs to reset. | | Low charge rate only | Corroded terminals or wrong mode | Clean terminals with baking soda/water. |