1. Product Overview
The Stinger SGP32 is a high-current 12V battery relay isolator designed to manage power distribution in vehicles with dual battery setups. It prevents the discharge of your primary starting battery by isolating it from secondary accessory batteries, ensuring reliable engine starting. This unit provides maximum current transfer for power-on-demand applications and extends battery life with its durable construction.
- 200 AMP Constant, 500 AMP Peak Current Battery Isolator and Relay
- Prevents primary battery discharge
- Power on demand: Maximum current transfer
- Extends battery life: 100,000 mechanical cycle life
- Universal 12 volt applications: Water resistant black phenolic plastic
- Ideal for 2nd audio battery isolation from vehicle systems: Reliable and efficient way to add secondary batteries to your system
- Compatible with all types of alternators and charging systems
Front view of the Stinger SGP32 200 AMP Battery Relay Isolator, showing its robust black housing and brass terminals.
2. Safety Information
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Always disconnect the vehicle's primary battery before performing any electrical work. Ensure all connections are secure and properly insulated to prevent short circuits. Wear appropriate personal protective equipment, including safety glasses and gloves, during installation. Consult a professional if you are unsure about any installation steps.
3. Package Contents
The Stinger SGP32 package includes:
- 1 x Stinger SGP32 200 AMP Battery Relay Isolator
4. Specifications
| Specification | Value |
|---|---|
| Brand Name | STINGER |
| Model | SGP32 |
| Part Number | SGP32 |
| Current Rating | 200 Amps |
| Contact Current Rating | 200 Amps |
| Maximum Switching Current | 1 Amps |
| Coil Voltage | 12 Volts |
| Maximum Switching Voltage | 12 Volts |
| Minimum Switching Voltage | 12 Volts |
| Wattage | 12 watts |
| Operation Mode | Automatic |
| Connector Type | Quick Connect |
| Contact Material | Copper |
| Contact Type | Normally Open |
| Mounting Type | Chassis Mount |
| Item Weight | 1.4 Pounds |
| Unit Count | 1.0 Count |
| Manufacturer | Stinger |
| UPC | 609098797788, 609098796019 |
5. Installation
Proper installation is crucial for the optimal performance and safety of your Stinger SGP32 battery isolator. Always ensure the vehicle's ignition is off and the primary battery is disconnected before beginning installation.
5.1 Wiring Diagram
A schematic diagram illustrating the connection of the Stinger SGP32 battery isolator to a primary battery, secondary battery, alternator, and vehicle accessories.
5.2 General Installation Steps
- Mounting: Choose a secure, dry location for the isolator, away from excessive heat or moving parts. Use the provided mounting bracket to firmly attach the unit to a stable surface in your vehicle.
- Primary Battery Connection: Connect a heavy gauge positive cable (e.g., 0-4 gauge) from the primary battery's positive terminal to one of the large terminals on the isolator.
- Secondary Battery Connection: Connect another heavy gauge positive cable from the secondary battery's positive terminal to the other large terminal on the isolator.
- Ground Connection: Connect a small gauge wire (e.g., 16-18 gauge) from the isolator's small ground terminal to a clean, bare metal chassis ground point.
- Ignition/Activation Wire: Connect a small gauge wire from the isolator's small activation terminal to a 12V ignition-switched source. This source should provide 12V only when the engine is running or the ignition is on, allowing the isolator to engage and charge the secondary battery.
- Fusing: Install appropriate fuses (e.g., 200A for main battery lines, 10A for activation line) as close to the batteries as possible to protect the wiring and components.
- Recheck Connections: Double-check all connections for tightness and proper insulation.
- Reconnect Battery: Reconnect the primary battery and test the system.
Side view of the Stinger SGP32 200 AMP Battery Relay Isolator, highlighting its metal mounting bracket and terminal connections.
6. Operation
The Stinger SGP32 operates automatically. When the vehicle's engine is running and the primary battery is being charged by the alternator, the isolator will sense the voltage increase and connect the secondary battery in parallel. This allows the secondary battery to charge. When the engine is turned off, or the primary battery voltage drops below a certain threshold, the isolator will disconnect the secondary battery, preventing it from drawing power from the primary battery. This ensures your primary battery remains fully charged for starting the vehicle.
7. Maintenance
To ensure long-term performance of your Stinger SGP32 battery isolator:
- Regular Inspection: Periodically check all wiring connections for tightness and corrosion. Clean any corrosion with a wire brush and battery terminal cleaner.
- Cable Condition: Inspect battery cables for any signs of wear, fraying, or damage. Replace damaged cables immediately.
- Unit Cleanliness: Keep the isolator unit clean and free from dirt, dust, and moisture.
- Ventilation: Ensure the mounting location allows for adequate airflow around the unit to prevent overheating.
8. Troubleshooting
If you experience issues with your Stinger SGP32, consider the following:
- Secondary Battery Not Charging:
- Check the ignition/activation wire connection. Ensure it receives 12V when the engine is running.
- Verify all main power connections are secure and free of corrosion.
- Check for blown fuses in the main battery lines or the activation line.
- Ensure the primary battery is charging correctly from the alternator.
- Primary Battery Draining:
- Confirm the isolator is disconnecting the secondary battery when the engine is off. If not, the activation wire might be incorrectly connected to a constant 12V source.
- Inspect for any parasitic draws from accessories connected directly to the primary battery.
- Unit Overheating:
- Ensure adequate ventilation around the isolator.
- Verify that the current draw does not exceed the isolator's rated capacity (200A continuous, 500A peak).
9. Warranty
The Stinger SGP32 200 AMP Battery Relay Isolator comes with a 1-year warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage resulting from improper installation, abuse, accident, or unauthorized modifications. Please retain your proof of purchase for warranty claims.
10. Support
For further assistance, technical support, or to explore other STINGER products, please visit the official STINGER store:
