Parasitic Draw Test

Mobile parasitic draw test at your home or office, to find what is draining your battery overnight rather than replacing it again.

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Service Info

Typical Duration 2 hours

We load test the battery and check charging output, allow the vehicle to settle fully, measure the parasitic current draw, isolate the responsible circuit fuse by fuse, and identify the component or aftermarket fitment causing it.

Skip the garage, our master mechanics come to you

At your home or office
Fair & transparent pricing
6-month, 6000km warranty

The Most Trusted Mobile Parasitic Draw Test

A parasitic draw is something in the car continuing to consume current after everything has shut down. A healthy modern vehicle draws a small amount to keep its modules alive, and anything much beyond that flattens the battery overnight. Because the symptom is a flat battery, most people replace the battery first, which changes nothing. Michanic tests for parasitic draw at your home or office and finds the actual circuit.

Why Choose Our Mobile Parasitic Draw Test Services?

  1. Stops Replacing Batteries:
    A battery that keeps going flat is usually a symptom. Finding the draw is what ends the cycle of replacing batteries that were never faulty.
  2. Done Where The Car Sleeps:
    The test requires the vehicle to settle fully, which means doing it where it normally stands rather than in a busy workshop.
  3. Circuit Isolated Methodically:
    Fuses are removed one at a time while measuring, which identifies the exact circuit rather than the general area.
  4. Charging System Checked Too:
    A battery going flat can also mean the alternator is not charging properly. Both are established, not assumed.

Why We are the Best Choice for Mobile Parasitic Draw Test

  • Proper Settling Time:
    Modules take time to go to sleep. Measuring too early gives a falsely high reading and sends the diagnosis in the wrong direction.
  • Aftermarket Fitments Considered:
    Alarms, trackers, dash cameras and audio installations are among the most common causes and are checked specifically.
  • Battery Tested Properly:
    The battery itself is load tested, because a failing battery and a parasitic draw produce the same morning symptom.
  • Findings Explained:
    You are told which circuit is responsible and what the options are, rather than handed a code.

Repeatedly flattening a battery does lasting damage to it, so a parasitic draw quietly destroys each replacement battery you buy. Deep discharge damages the plates, which is why the second and third batteries often seem to fail faster than the first. There is a second consideration on modern cars: control modules behave unpredictably at low voltage, so a car with a draw can throw fault codes across unrelated systems, which sends diagnosis off in entirely the wrong direction until the underlying drain is found.

Frequently Asked Questions

  • What is a normal parasitic draw?
    Modern vehicles typically settle to a small draw of a few tens of milliamps once all modules are asleep. Anything substantially above that will flatten a healthy battery over a few days or a single night.
  • Why does my new battery keep going flat?
    Because the battery was never the problem. Something is drawing current after shutdown, and each replacement battery is being deep discharged and damaged in exactly the same way.
  • What usually causes a parasitic draw?
    Aftermarket alarms, trackers, dash cameras and audio installations are the most common, followed by a module that fails to go to sleep, a faulty door or boot switch keeping a light on, and a failing alternator diode.
  • How long does the test take?
    It needs time, because control modules take a while to shut down after the car is locked. Measuring before they sleep gives a false reading, so the settling period is part of doing the test properly.
  • Could it be the alternator instead?
    It can. A failing diode inside the alternator allows current to flow back through it when the engine is off, and a charging system not replenishing the battery properly gives the same morning symptom. Both are checked.