A 0.2 Amp Battery Drain can be a significant issue for your car, potentially leading to a dead battery and leaving you stranded. This article will explore the causes, symptoms, and solutions for a 0.2 amp parasitic draw.
What is a 0.2 Amp Battery Drain?
A parasitic draw, also known as a parasitic drain or key-off drain, refers to the electrical current that continues to flow from your car’s battery even when the ignition is off. A 0.2 amp drain, while seemingly small, can deplete a fully charged battery over time. A typical car battery has a capacity of around 48-72 amp-hours (Ah). With a constant 0.2 amp drain, a 60Ah battery could theoretically be fully drained in approximately 300 hours (12.5 days).
Common Causes of a 0.2 Amp Drain
Several components can contribute to a 0.2 amp parasitic draw. Some common culprits include:
- Faulty Interior Lights: A malfunctioning door switch, glove box light, or trunk light can stay on continuously, draining the battery.
- Aftermarket Accessories: Alarms, stereos, and other add-ons can sometimes draw excessive current even when turned off. Poor installation or faulty wiring are often to blame.
- Clock and Radio Memory: While these typically draw minimal current, a malfunction can increase the drain.
- Faulty Relays or Modules: A sticking relay in systems like the fuel pump or ignition can cause a continuous drain. Similarly, a faulty electronic control unit (ECU) or body control module (BCM) can contribute to the problem.
- Glove Box or Trunk Lights: Similar to interior lights, these can stay on due to faulty switches or wiring.
Symptoms of a 0.2 Amp Battery Drain
The most obvious symptom is a dead battery, especially after the car has been sitting unused for a few days. Other signs include:
- Slow Engine Cranking: The engine may crank slowly or struggle to start.
- Dimming Interior Lights: Lights may appear dimmer than usual.
- Clicking Sounds When Starting: This indicates the battery doesn’t have enough power to engage the starter motor.
- Warning Lights on the Dashboard: Some cars may display warning lights related to low battery voltage.
Diagnosing and Fixing a 0.2 Amp Battery Drain
Identifying the source of the drain requires a systematic approach:
- Confirm the Drain: Use a multimeter to measure the current draw with the ignition off and all accessories turned off. A reading of 0.2 amps confirms a significant drain.
- Isolate the Circuit: Remove fuses one at a time while monitoring the ammeter. A drop in current when a specific fuse is removed indicates the circuit causing the drain. Consult your car’s owner’s manual to identify the components on that circuit.
- Inspect Components: Once the circuit is identified, inspect the related components for faults. Look for damaged wiring, sticking relays, or malfunctioning switches.
- Test Individual Components: If necessary, disconnect suspected components one by one to pinpoint the exact source of the drain. For example, disconnect the aftermarket alarm system to see if the drain disappears.
Conclusion
A 0.2 amp battery drain can significantly impact your car’s reliability. By understanding the causes, symptoms, and diagnostic procedures, you can effectively identify and address the issue, preventing future dead battery situations. If you’re uncomfortable working with electrical systems, consult a qualified auto electrician for assistance.
