HomeServicesAlternators & Starter Motors
A battery light on while you drive, headlights dimming at idle, or one click and nothing on a cold start all point at the charging or starting system. We handle these auto electrical repairs in Logan in our workshop, and we test before we replace anything.
For alternator repair in Logan, we first test charging output and starter draw with the unit still on the car. Then we pull it and bench test it. That tells us whether brushes, a voltage regulator, bearings or a solenoid can be repaired, or whether an exchange or new unit is the better call. You get both options explained, with the test results behind them.
Many late-model cars use smart alternators and start-stop systems, which are fussier about the battery and the way the unit is fitted. We check the battery too, so the work lasts, and we say so if the battery is the real problem. For a starter motor repair in Logan or an alternator replacement, call 07 3566 2108 or use the quote form on this page to book the vehicle in.
Most charging and starting complaints trace back to a handful of faults. Here is what we test for on every alternator repair and starter motor repair that comes into the workshop.
The battery light comes on, or the battery goes flat after a drive. Common causes are worn brushes, a failed voltage regulator, a faulty diode pack or a slipping belt. We measure charging voltage at the battery at idle and under load, then check the belt, pulley and the unit itself. That way we repair the part that has actually failed, not the one that merely looks likely. If the belt is the culprit, we say so.
A failing regulator can push too much voltage into the system. That boils batteries and upsets sensitive electronics, including the ECU. If your headlights flare, bulbs keep blowing or the battery smells sulphurous, we log voltage under load and at different revs to catch the spike. Overcharging does quiet damage, so it is worth testing early, before it reaches the battery or the electronics. A voltage test takes the guesswork out.
One click or a slow crank usually means the starter is not getting enough current, or cannot use what it gets. We check solenoid contacts, brushes and the starter drive, and measure voltage drop on the main cables before blaming the motor. A starter that spins freely on the bench but struggles on the car often points to a cable or earth problem instead. We find out which before quoting.
Starters and alternators depend on heavy cables and earths. Corroded, loose or cracked ones waste current as heat and can mimic a failed unit. We voltage-drop test the battery cables, the starter feed and the earth straps between the engine, body and battery, so a good starter or alternator is never replaced because of one bad connection. Cables are the easiest thing to rule out, so we check them first.
Every job follows the same four steps, whether it is an alternator or a starter. You see the results before any parts are ordered.
We measure charging voltage, ripple and starter current draw, plus voltage drop across the cables and earths. This shows whether the charging system or the starting circuit is at fault before anything comes off the vehicle, and it often saves a unit from being removed for nothing.
If the unit is the suspect, we remove it and put it on the bench under load. That confirms the fault and shows exactly what is worn, from brushes to bearings to the regulator, rather than relying on a guess made while it is still bolted to the engine.
We explain what the bench result means and what your options are. Where it makes sense, we quote a repair and an exchange or new unit side by side, so you can compare them and decide what suits the vehicle and how long you plan to keep it.
After refitting, we check charging voltage and cranking again on the car, and check the battery and belt while we are there. Handover comes only once the readings are right, so you leave knowing the fault has been fixed rather than hoping it has.
Book the vehicle in and we'll test it and price the repair before any work starts.
Is it worth fixing an alternator? Often yes, but not always. The right choice depends on what failed and the condition of the rest of the unit.
If the fault is brushes, a voltage regulator or bearings and the case and windings are sound, repairing your existing alternator is a sensible option. The unit stays matched to your engine, and only the failed parts are replaced. We confirm the windings on the bench first, because a repair on a damaged rotor or stator will not last. The same thinking applies to starter motors with worn brushes or solenoids.
If the windings are damaged, the case is cracked or the failure has repeated, an exchange or new unit is usually the better path. Smart alternators communicate with the engine computer, and some are not practical to rebuild. Parts availability also matters, since a repair is only worthwhile when the parts can be sourced. We lay out the trade-offs so you can choose with the facts in front of you.
The City of Logan covers 957 km², so many local trips are long ones, and plenty of the driving is on the Pacific Motorway, which runs through Springwood, Loganholme and Beenleigh.
A caravan or loaded trailer on the 116 km Mount Lindesay Highway, Brisbane to the Queensland-New South Wales border, keeps the alternator working hard.
Heat is hard on the battery as well. NRMA notes that temperatures over 30°C can speed up a battery's internal reactions and shorten its life, and that is general motoring advice rather than anything specific to south-east Queensland. A weakened battery makes the alternator work harder and the starter strain, so we test all three together.
Our process is built so you understand the fault before you pay to fix it.
We explain the test results before anything is ordered. Charging voltage, starter draw and bench readings are the reasons for the repair, so you can see what the work is based on. If the numbers show the unit is fine, we say so and keep looking for the real cause.
A weak or tired battery strains a new alternator or starter and can bring the same symptoms straight back. We test the battery as part of the job, including how well it holds a charge, so the repair is not undone by the part that feeds it. If it needs replacing, we tell you.
The failed part is shown to you so you can see what went wrong, or returned if you want to keep it. That keeps the repair open to inspection, and means you are not asked to take our word that the old unit was beyond use. It also lets you see the wear for yourself, such as burnt contacts or a scored shaft.
Several things move the cost of an alternator replacement, and the same factors apply to starter motors. As a guide, auto electrical labour typically runs about A$90 to A$150 an hour (ServiceTasker, Feb 2026); the part itself is on top of that. We do not guess at the total. The final quote is given on inspection, so use the form beside this page to start a free written quote.
Repairing brushes, a regulator or bearings costs differently to an exchange or new unit. The bench result tells us which suits your vehicle.
Some engines let us reach the alternator or starter easily. Others need other parts removed first, which adds labour to the job and affects the quote.
Some vehicles need coding or registration after a new unit is fitted, so the engine computer recognises it. That adds a step to the job.
Common units are easy to source. Less common or older ones take more effort to find, and that affects the quote.
You can usually tell a starter fault from an alternator fault by when the problem shows up. A starter fault shows when you turn the key: a click or no crank. An alternator fault shows as a battery light and a battery that goes flat while driving. A charging and starting test confirms which one it is.
A battery problem means it will not hold a charge, while an alternator problem means it is not being charged. A flat battery that recovers after a jump and goes flat again is often a charging fault. A charging test on the car separates the two, which is why we check both.
The first signs of a bad alternator are a battery light on the dash, dim or flickering lights, a whining noise from the engine bay and a battery that keeps going flat. Electrical extras such as the radio or windows can also act up. Get the charging tested before it strands you.
Yes, an alternator can often be repaired when the fault is brushes, a voltage regulator or bearings and the windings are sound. We bench test the unit to check first. If the windings or case are damaged, an exchange or new unit is the safer choice. That is why alternator repair starts with testing.
The most common causes of alternator failure are worn brushes and bearings, heat, belt problems and fluid leaks onto the unit. A faulty battery can also overload it and shorten its life. Testing the whole charging system finds what caused the failure, not just what broke.
Replacing an alternator can be a small job or a bigger one, depending on the engine. Some alternators are easy to reach. Others need other parts removed first, and some smart systems need coding after fitting. We look at your vehicle before we quote.
Your car may not start with the lights and radio working because those use little current and the starter needs a lot. A weak battery, a poor connection, a worn solenoid or a failing starter motor only shows up on cranking. We test starter draw and voltage drop to find which it is, which is also where a starter motor repair begins.
Call 07 3566 2108 or send the form to book a charging and starting test. We will check the battery, alternator and starter and explain the results.