5 DIAGNOSTICS Fault finding XF 95 series 3.3 EARTHING PROBLEMS Earthing problems are mainly caused by corrosion between the contact surfaces of electrical connections. Earthing problems can only be detected using a multimeter (preferably digital). A digital tester is preferable because usually only a few volts will be measured and an analogue meter is generally not precise enough for this purpose. To find out whether a specific earthing point has a good earth connection, use a voltmeter to measure the voltage between the negative battery pole and this earthing point. Switch on as many consumers as possible. If there is a correct earth connection, no voltage should be found.
In practice, however, a loss of approx. 0.5 volts will often be measured. If the reading is higher, the earth connection must be checked carefully. In this way, the earth connections of all consumers can be checked and measured. 1 W 5 03 014 3-4 200303