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ELECTRICAL 1 FAULT DIAGNOSIS GENERAL INFORMATION The electrical fault diagnostic tool on Discovery See INTRODUCTION, Information, Fault Diagnostic Equipment GENERATOR TESTING Service repair no - 86.10.01 Charging system check 1. Check battery is in good condition, with an open circuit voltage of at least 12.6 V. Recharge or 2. Check drive belt condition. See SECTION 10, Maintenance, Under Bonnet [Hood] 3. Check battery connections are clean and tight. tight. 5. Ensure there is no drain on battery from, for example, interior, under bonnet [hood] or door Generator test Following instructions refer to use of suitable test 6. Connect test equipment referring to manufacturer’s instructions. 7. Start engine and run at 3000 rev/min without accessory load. 8. Rotate carbon pile load control to achieve greatest output (amps) without allowing voltage 9. Run engine at 3000 rev/min, switch selector to regulator test, read voltmeter. A reading of 13.6 10. Switch selector to diode/stator test, switch on headlamps to load generator. Raise engine TESTING IN POSITION Charging circuit resistance test. 1. Connect a low range voltmeter between generator terminal marked B+ and positive 2. Switch on headlamps, start engine. Run engine at approximately 3000 rev/min. Note voltmeter 3. Transfer voltmeter connections to frame of generator and negative terminal of battery, and 4. If reading exceeds 0.5 volt on positive side or 0.25 volt on negative side, there is a high |