Car Won't Start? How to Tell What Is Wrong

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Servicing Guide · Updated June 2026 · By the Brad Ward Motors workshop team

When your car will not start, the sound it makes when you turn the key tells you a lot. A rapid clicking or slow, laboured cranking usually means a flat or dying battery, which is by far the most common cause. Complete silence can be the battery, a connection, or the starter. The engine cranking normally but not firing points to fuel, spark or an immobiliser. At Brad Ward Motors in Henderson we test the battery, charging system and starting circuit, tell you exactly what has failed, and quote it before any work.

The sound when you turn the key points to the cause
Fast clicking or slow cranking usually means a flat battery
Most batteries wear out after about four to five years
Sometimes the real fault is the alternator, not the battery
Normal cranking but no start points to fuel, spark or immobiliser
We test properly so you only replace what has actually failed

What the symptoms tell you

Listen to what happens when you turn the key. A fast clicking sound, or the engine turning over slowly and unwillingly, almost always means the battery is flat or on its way out. A single click or nothing at all can be a dead battery, a loose or corroded terminal, or a failed starter motor.

If the engine cranks over at normal speed but will not catch and run, the battery is fine and the problem is more likely fuel, spark, a sensor or the immobiliser. Knowing which group you are in saves time and points us straight at the cause.

The battery, the most common cause

Most no-start calls come down to the battery, especially on the first cold morning after a run of short trips, where the battery never fully charges. Batteries also simply wear out, usually after about four to five years.

A jump start will often get you going, but if the battery is at the end of its life it will let you down again. We test the battery properly under load and check the charging system, because sometimes the real problem is the alternator not recharging the battery rather than the battery itself. We tell you which it is so you are not sold a battery you did not need.

When it is not the battery

If the battery and connections test fine, we look further. A worn starter motor can crank slowly or not at all even with a good battery. A no-start with normal cranking points to the fuel system, ignition, a crank or cam sensor, or a security or immobiliser fault that is not letting the engine run.

These need proper diagnosis rather than throwing parts at it. We use diagnostic equipment to read fault codes and test the relevant circuits, so we find the actual cause instead of guessing, and you only pay to fix what is genuinely wrong.

Getting going again

If you are stuck, a jump start or a tow to our Moselle Ave workshop will get the car to us. Once it is here we test the battery, charging and starting systems and pinpoint the fault.

You get a no-obligation quote before any work, and we explain it plainly. A battery is usually a quick same-day fix, and we keep an eye on battery and charging condition at every service and WOF so it is less likely to catch you out. Courtesy cars are available on request if you need to keep moving.

Talk to a real Henderson mechanic

Quotes, no surprises, all makes and models. MTA approved, 35+ years on Moselle Ave.

Book Online (09) 837 1723

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FAQ

Car Won't Start: What to Check: common questions

A rapid clicking sound when you turn the key almost always means the battery does not have enough power to turn the starter motor, so the most likely cause is a flat or dying battery. It can also be a loose or corroded battery terminal stopping the current getting through, or in some cases a failing starter motor. The quickest test is a jump start: if the car fires up, the battery or charging system is the issue and needs checking, because a battery at the end of its life will leave you stranded again. At Brad Ward Motors we test the battery under load and check the alternator and connections, so we can tell you whether you need a battery, a clean-up of the terminals, or something else. Call us on (09) 837 1723.

They cause similar symptoms, so the only reliable way is to test both, which we do as a matter of course. As a rough guide, if the car has been getting slower to start over a few weeks, or struggles on cold mornings, the battery is the usual suspect, especially if it is more than four or five years old. If the battery has been replaced recently but keeps going flat, or warning lights flicker and the car dies while driving, the alternator may not be recharging the battery properly. Replacing a battery when the real fault is the alternator just means a flat battery again, which is why we test the whole charging system before recommending anything. Bring it to our Henderson workshop and we will tell you exactly which it is.

A jump start will often get you going, but whether it is safe to keep driving depends on why it would not start. If the battery was simply flat from short trips or leaving a light on, a good run may recharge it. But if the battery is worn out or the alternator is not charging, the car will let you down again, possibly somewhere less convenient. A jump start is best treated as a way to get the car to a workshop rather than a fix. Drive it straight to us at Moselle Ave in Henderson, or call (09) 837 1723, and we will test the battery and charging system, tell you the real cause, and sort it so it does not happen again.

Most car batteries last somewhere between four and six years, though it varies with how the car is used. Lots of short trips, where the battery never fully recharges, shorten its life, as does sitting unused for long periods. Auckland's mild climate is kinder to batteries than very cold places, but they still wear out and tend to fail on the first cold morning of winter, often without much warning. If your battery is in that age range or the car has been slow to start, it is worth a quick test before it strands you. We test the battery and charging system at every service and WOF, and can replace it the same day if needed, quoting the right battery for your car first.