Fitting a new speedometer cable

Speedometer failure is likely to be caused by a fault in the cable that runs from the gearbox to...

Working on the wiring system

The electrical wiring in a car is a system of colour-coded wires called the loom. Where several w...

How a speedometer works

Of all the instruments you can find on a modern car dashboard, only one is a legal requirement -...

Car horn not working?

Cars are usually fitted with a high-frequency (HF) or windtone horn as standard equipment, norma...

Checking the instruments

A car usually has up to six main instruments — speedometer and tachometer (rev counter); fuel, o...

How to check a relay switch

If a component that is fed with electricity through a relay (See How car electrical systems work...

Checking and replacing fuses

When an electrical component stops working the fault may be in the component, in the electrical ...

Checking headlamps and lights

It is an offence in law not to have all obligatory lights working. Check them frequently, especi...

How to align headlights at home

Only a garage with special equipment can align headlamps accurately. However, you may need to do ...

Fitting new headlamps

Sealed-beam headlamps are simple to change, but the way of gaining access to them varies from ca...

Testing and replacing a flasher unit

There are two basic types of flasher unit. One is operated by a piece of wire or a bimetallic str...

Servicing the windscreen-wiper mechanism

The windscreen-wiper mechanism needs little maintenance. At service intervals drip a little oil d...

How to fix a car fan

Electric radiator-fan motors are switched on either by the ignition switch - and run while the e...

Identifying and suppressing radio interference

Car radio interference originates usually in the ignition system, the charging circuit or among ...

Fixing a windscreen wiper motor

Removing a windscreen wiper motor Disconnect the battery. Remove the electrical connections from ...

How an oil pressure gauge works

The oil pressure gauge is one of the most important instruments in a car. It acts as an indicato...

How to fix a car heater

The car's heating system consists essentially of a motor-driven fan to blow warm air from the en...

Fixing a heated rear window

There are a number of possible causes for a rear window heater not working, including a blown fus...

How to fix an indicator stalk

The majority of indicator stalks are mounted on the side of the steering column so you can easil...

Fixing a reversing light

Reversing lights are not generally a legal requirement but they are useful. They serve two purpo...

How to test electrical circuits

If there is trouble without an obvious cause in any electrical component, test the circuit to fin...