Electrical System

Is your battery suffering from insecurities

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Yes that’s correct, your battery maybe be suffering under the bonnet without you even knowing.The battery is something that you never want to upset.
When a battery gets cross, its gets angry and then may explode into a rage of fire.

How can a battery get cross, angry and explode you ask ?.

Well not many people may know how to care for the battery in ...

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COOLING SYSTEM – Thermo fan switch

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PURPOSE

The thermo fan switch when it reaches its designed temperature is designed to switch on and when it reaches a lower temperature, it is designed to switch the power off.  The thermo fan switch receives power from the fuse box.  When it reaches a temperature the switch will bridge the terminals thus turning the thermo fan on.

 

THINGS TO LOOK FOR

Check that the connections are secure and observe that the thermo fan is switching on and off.  Sometimes this may not ...

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COOLING SYSTEM – Thermo fan relay

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PURPOSE
The thermo relay is a heavy duty switch to prevent the request switch from overloading with excessive current or heat. 

THINGS TO LOOK FOR
As the thermo fan operates over years the internal mechanisms may start to wear and cause a resistance in the thermo fan relay causing an overload on to the relay and the fuse.  A common sign is a faulty relay.  Melted terminals on the relay indicate that the thermo fan may be overloading the system or ...

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THE NOISE – Thermo fan switching on

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THE EFFECT
The cooling system will maintain normal operating temperature under all driveable conditions. 

THINGS TO LOOK FOR
It’s always a good idea to look at the thermostatic fan to understand how it operates.  Because thermostatic fans are thermostatically controlled and they should switch on and off.  A good thermostatic fan in a very good cooling system will switch on for somewhere between 20-40 seconds.  If the fan switches on for longer than 60 seconds this might be a cooling system ...

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ELECTRICAL SYSTEM – Starter motor relay

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PURPOSE
The starter motor relay is designed to switch a 12 volt power supply from the ignition to the starter motor solenoid.  The starter motor relay may also be fitted to an older vehicle with a possible voltage loss on this 12 volt supply.  A starter motor relay is a high current switch that may malfunction after 5-10 years in operation.

THINGS TO LOOK FOR
A starter motor relay if fitted as an after market item may malfunction if the wiring ...

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ELECTRICAL SYSTEM – Starter motor

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PURPOSE
The starter motor is designed to crank the engine until it starts.  This is performed with a pinion gear which is connected to a fly wheel or a ring gear at the rear of the motor.  A starter motor will require somewhere between 50-100 cranking AMPS to be energised and crank the motor.  The start motor should last for at least 5-10 years but unfortunately they don’t.

THINGS TO LOOK FOR
A starter motor may start to create a high ...

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EFI – Fuse box

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PURPOSE
The fuse box is designed to hold fuses and relays and there may be several of these around the vehicle.  It’s always a good idea to keep a few spare fuses, just in case.

THINGS TO LOOK FOR
When checking the fuses, it’s best to check the fuses with a test light and don’t rely on the fuse index map indicating where the fuses connect as they may be incorrect.  What is meant by the map is that sometimes when ...

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EFI – Computer

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PURPOSE
The computer or ECM [electronic control module] or ECU[electronic control unit] is designed to manage the fuel system, ignition system, and depending on the design, it also manages the automatic transmission as well as turning on the air conditioning.  The computer is programmed to collect information and make about 11,000 decisions every minute.  It may also store fault codes for the technician to decipher and rectify problems as required.

THINGS TO LOOK FOR
The computer is located in a cool ...

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EFI – ELECTRONIC FUEL INJECTION

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PURPOSE
Electronic fuel injection [EFI] is designed to manage the fuel system and inject fuel into the combustion chamber.  There are several types of EFI eg group injection, sequential injection.  All injection systems are designed to offer 95% fuel economy in normal operating temperatures.

THINGS TO LOOK FOR
Any EFI will suffer if the fuel level runs low.  This being a main focus as this will cause the EFI to fail. Because the fuel operates on pressure and when the fuel ...

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EFI – Fuel pump relay

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PURPOSE
The fuel pump relay is designed to switch the fuel pump on with a low voltage.  At the same time the relay is a heavy duty switch making it possible to switch on and off without wearing out the switch or preventing arcing in the switch.  A fuel pump relay is designed to switch off if overloaded.

THINGS TO LOOK FOR
When the fuel pump relay seems to be getting warm to hot, this indicates that it is either being ...

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