Buying a Starter Motor


When you are looking to buy a starter motor to replace your old one it is important to match up the part numbers to be sure it’s the correct one for your car. Get it right the first time – You do not want to purchase the wrong one and then go though the process of finding the correct one all over again.

Ever part is different so we need to look out for different things for different parts. With starter motors we look out for the general condition (not to old and worn). We also test the starter motor by starting the car numerous times to ensure it is in full working order as well as testing the volts. Starter Motor’s from cars that don’t run because of an engine or electrical problems can’t be tested so we have to make a decision on whether to keep it or not. This depends on the condition of the starter motor and the reason why the car is an end of life vehicle! Cars are not end of life because of a starter motor problem so it is very , very unlikely that an end of life car we are dismantling because of engine or electric problems had a problem with the starter motor!

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Where to find the Part Number

Where to find the part number depends on the make and model of the starter motor. In the following images we show you where to find the part number and the voltage, so you can cross reference it with your part number and voltage to be sure it’s the correct starter motor for your car.

Serial number on starting motor.

Where to find the parts number on a starter motor

Parts number

Where to find the parts number

It is important to purchase a starter motor with the same voltage and not one with less. If you purchase  one with less volts there will not be enough pressure or force to make the car start

How a Starter Motor works?

In order for an engine to start it needs to be turning at speed to bring in fuel and air into the cylinders , the starter motor will do the turning. The shaft on the starter motor has a pinion which connects around the edge of the flywheel. In a car where the engine is at the front of the car , the starter motor can be found towards the rear and bottom of the engine. In order for the starter motor to function it needs an electrical current , the starter motor gets this electrical current from the wires on the battery.  Due to the power of the current a solenoid is required. The solenoid acts as a switch to turn the starter motor on or off and to avoid any danger such as sparks.

The starter motor has several components: a solenoid, a pinion and a return spring. A solenoid is a type of electromagnet that draws in current from the battery and ignition switch. The starter is powered by the ignition. When engage the key to the ‘ignition on’ position it will provide a current to the solenoid. On the ignition switch there is a return spring and once you remove the key it springs back and turns the starter motor off. When the solenoid is energized it operates a lever which pushes the pinion into mesh with the ring gear.

Testing a Car Battery

There is only one way to know if your battery is GOOD or BAD and that is to test it. There are many places that will test your battery for free. If you are unable to drive your car to have the battery tested remove the battery and just take the battery to be tested.

Battery charge too low?

When the voltage reaches less than 12.5 volts (around three quarters), this means that the battery needs to be recharged. You can use the standard methods for getting the battery recharged such as by either driving the cars for ten to twenty miles (preferably in an area where you can run the car at 40 miles per hour plus such as on a motorway or A road), or by using a suitable portable battery charger to recharge the battery.

The importance of a strong battery in Winter weather

In wintry weather, it is more vital than ever that the battery is well charged and win good condition. Cold winter weather increases the cranking load which the battery experiences and if you want to get your vehicle started in these cold conditions more attention is needed. At hotter temperatures the oil is thinner and in winter the reverse happens, meaning that it takes more amps (ampage) power to get the engine running with the thicker oil.

Cold winter weather also has an effect on the battery, and the ability for the amps to be circulated by the battery.A typical car battery can only deliver about 65 percent of the energy at around 0 degrees farenheit (although at this temperature which is close to minus 18 celsius) is a relatively rare occurrence in the UK. The key point though is that low temperatures do effect the battery!

At All Your Spares Ltd  – What we test and look for!!!!

'S Terminal Circuit'

‘S Terminal Circuit’

Testing the Ignition Switch

When the key is turned to start the engine , power will flow from the ignition switch through the neutral safety switch and onto the S terminal of the starter solenoid. If you have a fully functioning starter motor you it should receive a 12 Volt signal and this will cause the starter motor to power and start the engine. If you have tested the voltage and got a reading of anything below 10 Volts then it may be a problem the ignition switch , the neutral safety switch or the S terminal circuit.

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