Car Maintenance

Also in Car Maintenance
Inside Fuses
1. Fuse Replacement
Fuses

Fuse Replacement

Fuses protect a car's electrical circuits against overload. If an electrically-powered item stops working, it could be because the fuse has blown. If you replace a fuse and it blows again, there's almost certainly a fault in the wiring or in the item concerned.

You'll need some spare fuses of the correct type and rating - check the vehicle handbook or your Haynes Service and Repair Manual for details. This will also tell you which fuse protects which circuit, and where the fuse boxes are.

fuses
1 The fuse box is usually under a cover near the glovebox or instrument panel. Sometimes there's one under the bonnet as well (see above). Switch off the ignition before starting work.

2 To remove a fuse, simply pull it from the panel. On some cars there's a plastic tool for doing this - otherwise, use your fingers or some slim pliers.

3 A blown fuse is easily recognised by the melted wire between the two contact blades (left) - compare this with a good fuse (right). The replacement fuse must be of the correct rating - this is shown by its colour or by the number stamped on it.

4 Push the new fuse firmly into its slot in the fuse box. Switch on the circuit concerned. If the new fuse blows immediately, there's a problem.

Warning!

Don't try to 'cure' a persistently blowing fuse by fitting one of a higher rating than that specified, or bypassing it with metal foil or wire. Serious damage or even fire could result.

Haynes Hints

  • It's a good idea to carry a few spare fuses in the car - they are usually included in a spare bulb kit.
  • One fuse sometimes protects several circuits - for example, the interior light may be on the same fuse as the clock.
  • If you don't have any spare fuses, in an emergency you can 'borrow' one from a non-essential circuit such as the heated rear window or the cigarette lighter.