Generator diagnostics
Diagnostic devices allow you to check the generator by measuring the output voltage or current with the electrical consumers on or off.
Note: The diagnostic tool's clamp meter is an inductive type (measuring range: 0 to 1000 A). They are installed without disconnecting the battery, which allows you to save the memory and settings of the control unit.
Install the measuring clamp directly on the generator output, the clamp arrow should point towards the generator (the diagnostic tool detects incorrect installation).
The measurement is carried out in three stages:
Text copied from an online resource [www.OpelBook.ru]
- measuring the battery voltage when the ignition key is in position "M";
- measurement without consumers of electricity of regulated voltage and current output;
- measurement with the maximum number of consumers of electrical energy of regulated voltage and output current.
Upon completion of the test, the obtained values are used to draw diagnostic conclusions:
- in battery voltage without load ＜ 12.3 V - the battery is discharged.
With power consumers switched off:
- regulation voltage ＞ 14.8 V - voltage regulator is faulty;
- regulated no-load voltage ＜ 13.2V or charging current ＜ 2A - charging circuit failure.
With power consumers switched off:
- regulation voltage ＞ 14.8 V - voltage regulator is faulty;
- adjustable voltage ＜ 12.7 V - it is necessary to check the output power of the generator in relation to its characteristics: minimum output current of the generator when all consumers of electricity are turned on (at 3000 rpm) - 80 A.
If the measured return current value is low, check:
- generator wear (brushes, etc.);
- battery connections;
- "mass" bus of the engine;
- generator compliance with technical specifications;
- drive belt tension.
If the output current value is normal, with a reduced regulated voltage value, the generator is not the cause.
The following reasons are possible:
- the vehicle has too many electrical consumers installed;
- the battery is discharged.
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