Chery B11. Manual - part 79

Chery Automobile Maintenance Manual 

           

39 

 

Additionally, when exciting current is stable, alternator output voltage increase with engine 

speed increasing. 

Chery Automobile Maintenance Manual 

           

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Alternator Specification 

Item Specification 

Type 

Battery voltage measurement 

Rated Output Power V/A 

12/90 

Voltage Regulator 

Embedded electronic adjustment 

Check Specification 

Item Standard 

Value 

Limit value 

Alternator output circuit voltage drop（at 30A）  Max. 

Value 

0.3 

－20℃ 14.2－15.4  

20℃ 13.9－14.9  

60℃ 13.4－14.6  

Voltage regulation range 

Voltage regulator usage 

temperature 

80℃ 13.1－14.5  

Output 

current 

 

70% rated output 

current 

Special Tool 

Tool Number 

Name 

Purpose 

 MB991519 

Alternator 

wiring 

connector 

Check S terminal 

voltage of 

alternator 

II. Voltage measurement experiment for alternator output circuit 

Check adjustment and experiment sequence 

The experiment is designed to check if the wiring between alternator B terminal and battery 

anode (including fuse) is OK. 

1.  Please check the following items before testing. 

a) 

Alternator installation status 

b) 

Alternator transmission belt tension 

c) Fuse 

status 

d) 

If abnormal noise exists during alternator running 

2.  Turn ignition switch to OFF. 

Chery Automobile Maintenance Manual 

           

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3.  Remove cathode cable of F battery 

4.  Disassemble alternator output cable from terminal B. Place a 0-100A DC ammeter for test in 

series between terminal B and removed output cable. 

(Connect anode cable of ammeter to B and connect cathode cable to the removed output cable.) 

Remarks: It is recommended to use clamp ammeter which may measure it even alternator output cable 

is not removed. 

The reason is that if the contact of alternator terminal B is not good, it may cause output current 

dropping. Therefore, if loosing terminal B to connect test ammeter suddenly when checking vehicle, it 

is impossible to find out the failure reason due to contact defeat when connecting. 

5.  Connect a digital voltmeter between alternator terminal B and battery anode. (Connect voltmeter 

anode cable to terminal B and connect volt cathode to battery anode.) 

6．Install engine tachometer. 

7．Connect battery cathode cable. 

8． Engine cover is kept open. 

9． Start on engine. 

10.When engine speed is 2500r/min, motor load is adjusted by opening/closing headlamp and other 

lamps, which keeps ammeter reading a little higher than 30A. Decrease engine speed slowly to 

ensure ammeter reading is 30A, and at the moment read the voltmeter reading. Limit value: max. 

0.3V  

Remarks: When motor output power is too large to drop ammeter reading to 30A, adjust it to 40A 

and read voltage difference reading. The limit value is changed to max. 0.4V at this moment. 

11.If voltmeter reading is higher than limit value, we can regard it as alternator output cable defeat. 

Therefore, please check wiring between alternator terminal B and battery anode (Including fuse). 

If the terminal is loose or wiring color changes due to excessive heat, it should be repaired and 

then make a test again. 

12.Make engine running at idle speed after experiment finish 

13.Shut off all lights and turn ignition switch to OFF 

14.Remove battery cathode cable. 

15.Remove ammeter, voltmeter and engine tachometer for test. 

16.Connect alternator output cable to generator B terminal. 

17.Connect battery cathode cable. 

Chery Automobile Maintenance Manual 

           

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Output Circuit Voltage Drop Measuring Schematic Diagram 

 

Storage 

battery

Voltmeter 

Storage battery 

Alternator

Terminal B

 

 

 

 

 

 

 

 

III. Output current 

measurement experiment 

The experiment is designed to check if alternator output current is OK. 

1.  Please check the following items before experiment. 

  Alternator installation status 

  Battery status 

Remarks: It is recommended to be in the status of slight battery discharge. If using battery 

full of power, it always can’t make experiment properly due to electronic load shortage. 

  Alternator transmission belt tension 

  Fuse status 

  If abnormal noise exists during alternator running 

2.  Turn ignition switch to OFF. 

3.  Remove battery cathode cable. 

4.  Remove alternator output cable from alternator terminal B. Connect a DC 0-100A ammeter in 

series between terminal B and removed output cable. (Connect ammeter anode cable to terminal 

B and then connect ammeter cathode cable to the removed output cable.) 

Caution: The connecting components must be fixed firmly with screw and nut, for large current 

will go through them. Don’t use clamp to fix them. 

Remarks: It is recommended to use clamp ammeter which may measure it even alternator output 

cable is not removed. 

5.  Connect a 0-20V voltmeter for test between terminal B and ground. (Connect voltmeter anode