You wanted to start your engine but it doesn’t. Why?
There are several factors to consider. You may have electrical issues, weak battery, motor starter problem, and heater switch problem.
Let’s see what your engine’s problem is.
1. When you turn on the key and your dashboard lights are normally functioning I guess you have no electrical lines busted.
If your car’s dashboard is working properly this can help you determine some issues on your engine. However, if the dashboard has electrical line problems it will not help you diagnose any issue on other parts of your vehicle.
2. Now you turn more the key for your heater (for diesel and for older cars) and it works properly. You should be happy that no lines have an issue.
For almost three days I have been puzzled why I cannot start the engine. Most of the time it just clicked and sometimes by accident it cranks.
I brought the battery to the shop to be checked and it’s working well. It’s even fully charged. The next step is to take down the starter for a checkup and possibly repair it. But, it neither had an issue.
By accident, we discovered that the culprit is the heater switch. Never it gave me a problem but only this time.
Let me explain what’s the issue of this heater switch. In an older car, we have this in preparation for the engine start. You have to press this to heat the glow plugs before you fully turn the ignition key. This is only for the first time when the engine is not used for overnight or for around 10 hours during the day.
The experience was that it works when heating the glow plugs but when you totally turn the key to crank the engine it doesn’t work. So it was an accident that this switch is being halfway pressed while the ignition key is turned. It’s weird because the normal way is to heat it, then release the switch and turn the ignition key. So this has to be fixed to bring it back to the usual and normal way.
3. When fully turning your key and the engine cranks but it’s slowly turning you may have a weak battery.
There are different reasons why a battery is weak. It may have drained
-draining of battery when parked for a long time may be caused by faulty wiring.
-draining when you are driving is a symptom that your alternator is not working properly.
-or, battery drains because it’s too old and it needs replacement.
4. You turn it more to crank your engine and it clicks but it doesn’t crank. You may be having an issue with your heater switch or starter.
Now if you have no issue with your heater switch and battery and the engine doesn’t crank you may be having an issue with the motor starter.
A motor starter that has a problem will not crank the engine. You will hear a click but doesn’t turn. It needs to be fixed. If it cannot be fixed, you may need to replace it.
This starter above is still working now. The armature gear has been deformed and I brought it to the lathe machine shop and they rebuilt it. Please read the related article on Armature Gear Rebuild.
And if you are looking for a replacement for your motor starter? You can find it here.