* Ideal: A healthy car battery with all electronics turned off should have a current draw of less than 50 mA.
* Acceptable: A draw of under 100 mA is often considered acceptable, especially if the car is newer and has more electronic components.
* Problematic: If the current draw exceeds 150 mA, there is likely a problem with a parasitic drain, meaning something is drawing power even when the car is off. This can lead to a drained battery over time.
Factors affecting current draw:
* Electronics: Even with the ignition off, some electronic components like the clock, radio memory, and alarm system will still draw power, contributing to the overall current draw.
* Accessories: Leaving accessories like headlights, interior lights, or the radio on will significantly increase the current draw.
* Faulty components: A malfunctioning component, like a faulty relay or a short circuit, can cause a high parasitic drain.
How to check current draw:
1. Use a multimeter: Connect the multimeter in series with the negative battery terminal.
2. Turn off all accessories: Ensure the car is completely off, headlights are off, and all other accessories are turned off.
3. Read the current: The multimeter will display the current draw in milliamps (mA).
What to do if you have a high current draw:
* Identify the culprit: Use a process of elimination to disconnect components and check the current draw after each disconnection. This will help pinpoint the source of the high drain.
* Repair or replace faulty components: If you find a faulty component, repair or replace it as necessary.
* Consult a mechanic: If you can't identify the issue or are uncomfortable working with electrical systems, consult a qualified mechanic for assistance.
Remember, a high current draw can quickly drain your battery and prevent your car from starting. Regular checks and addressing any issues promptly will ensure your battery stays healthy and your car is ready to go when you need it.
