Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Electrical Precautions


The following guidelines are intended to make sure the safety of the operator whilst preventing damage to the electrical and electronic components of this vehicle.


Prior to commencing any test procedure on the vehicle, make sure that the relevant test equipment is working correctly and that any harness or connectors are in good condition. It is particularly important to check the condition of all plugs and leads of mains operated equipment.


Never reverse connect the vehicle battery and always make sure the correct polarity when connecting test equipment.


Whenever disconnecting live ht circuits, always use insulated pliers and never allow the open end of the ht lead to contact other components, particularly ECU's.



The following precautions must be observed as failure to comply may result in exposure to ultra-violet rays, severe electric shock, burns or risk of an explosion.

  • Safety goggles and gloves must be worn.
  • Make sure that headlamps are switched off before removing bulbs.
  • Do not touch the glass portion of the bulb.
  • On no account should headlamps be switched on with the bulb removed from the headlamp.
  • Bulb testing may only be carried out with the bulb installed in the headlamp.
  • Bulbs must be disposed of in accordance with the local authority byelaws.


The engine compartment of a vehicle is a particularly hostile environment for electrical components and connectors. Always observe the following:

  • Make sure electrically related items are dry and oil free before disconnecting/connecting test equipment.
  • Make sure that disconnected multiplugs and sensors are protected from any possible oil, coolant or other liquid contamination. Any such contamination could impair performance or lead to component failure.
  • Never force connectors apart or pull on the wiring harness.
  • Always make sure locking tabs are disengaged before disconnecting multiplugs etc. and make sure that correct orientation is achieved before connection.
  • Make sure that any protection covers, insulation etc. are replaced if disturbed.

Having confirmed that a component is faulty, carry out the following:

  • Switch off the ignition and disconnect the battery.
  • Remove the component and support the disconnected harness.
  • When replacing electrical components, keep oily hands away from electrical connections and make sure that locking tabs on connectors are fully engaged.


Always refer to the Electrical Section of this manual - Battery Connection/Disconnection prior to attempting to connect or disconnect the battery.

For additional information, refer to: Specifications (414-01 Battery, Mounting and Cables, Specifications).


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