7.2.5. Check of adjustable tension (check of the regulator of tension)

This check defines whether correctly the regulator of tension of the generator operates the output tension of the generator.

Preparation for check
Check that the rechargeable battery installed on the car is completely charged.
Check a generator drive belt tension.
Turn an ignition lock key in the provision of "OFF".
Disconnect a wire from the negative plug of the rechargeable battery.
Connect the digital voltmeter between a conclusion of "S (L)" of the generator and "weight".
At first connect (+) a voltmeter wire to a conclusion of "S (L)" of the generator, then (–) a wire to suitable "weight" (to a body) or to the negative plug of the rechargeable battery.
Disconnect a regular wire from a conclusion "In" the generator.

Fig. 7.12. Scheme of check of adjustable tension


Connect the ampermeter (a direct current, with a range of 0-100 And) it is consecutive between a conclusion "In" the generator and the disconnected regular wire. Connect (–) an ampermeter wire to the disconnected regular wire (fig. 7.12).
Connect a control tachometer according to the instruction of the manufacturer. Connect a wire to the negative plug of the rechargeable battery.

Procedure of check
Include ignition and be convinced that the voltmeter shows the specified value of tension (tension of the rechargeable battery).
If the voltmeter shows 0 in, then or there was a break of a chain between a conclusion of "S (L)" of the generator and positive (+) the plug of the rechargeable battery, or the fusible insert fused.
Switch off all lighting and additional electric equipment. Start the engine.
Establish the frequency of rotation of a bent shaft of the engine, equal 2500 min.-1. Consider indications of the voltmeter when current of return of the generator makes 10 A or less.

Analysis of results
If indications of the voltmeter correspond to the nominal rates of adjustable tension specified in the table, then the regulator of tension is serviceable. If indications of the voltmeter do not correspond to the range of nominal rates, then either the regulator of tension, or the generator is faulty.
After completion of check gradually lower turns of a bent shaft of the engine to idling turns, then switch off ignition.
Disconnect a wire from the negative plug of the rechargeable battery.
Disconnect the ampermeter, the voltmeter and a control tachometer.
Connect a regular wire to a conclusion "In" the generator.
Connect a wire to the negative plug of the rechargeable battery.