An alternator is fitted to a motor vehicle to maintain the charge in the battery while the vehicle is in operation. engine runs on air, fuel and spark. The spark is the center of it all, and for that we need electricity. Your battery supplies electricity, but only enough to get you a few miles down the road. We need more. That's where the alternator comes in.The alternator continually charges the battery.
Major components of charging system:
nBattery
nDrive belt
nWiring
nWarning light (charge indicator)
nAlternator
nVoltage regulator
Rotor winding to ground test:
Set the meter on 2K. Place the black lead on the centre of the rotor shaft indicated. Place the red lead on the slip ring as indicated.
There should be no circuit between the rotor shaft and the slip ring.
The meter should read infinity
If there is a circuit the rotor winding has shorted to ground and will need to be replaced.
Spec | Meter reading | Pass / Fail |
Infinite | Infinite | Pass |
Place one end of each lead on the slip rings as indicated to obtain reading. The reading specification is 2Ω to 6Ω. Internal resistance 0.3
Spec | Meter reading | Less Internal Meter Resistance | Actual | Pass / Fail |
2 - 6 Ω | 3.2 | 3.2-0.3 | 32.9 | Pass |
Set Ohms meter on 200
Testing stator winding to ground test:
Spec | Meter reading | Less Internal Meter Resistance | Actual | Pass/ Fail |
0.0 Ω - .2Ω | 0.3Ω | 0.3Ω - 0.3 | 0 | Pass |
0.0 Ω - .2Ω | 0.3Ω | 0.3Ω - 0.3 | 0 | Pass |
0.0 Ω - .2Ω | 0.3Ω | 0.3Ω - 0.3 | 0 | Pass |
Set the meter on 2K. Place the red lead of the meter on the common stator winding terminal. the black lead of the meter on the body of Alternator as indicated E.(Second image from page 4)
Testing the rectifier positive diodes:
Set the meter on diode test mode. put the common lead on B terminal. Then touch the positive lead on each of the P terminals and record the reading.
Place the positive lead on B terminal. Then touch the common lead on each of the P terminals and record the readings. The resistance should be high.
Results for positive diode testing with common lead on B | ||
No | Spec 0.5 VD to 0.7 VD | Pass / Fail |
1 | .528 VD | Pass |
2 | .527 VD | Pass |
3 | .519 VD | Pass |
4 | .524 VD | Pass |
Results for positive diode testing with positive lead on B | ||
No | Spec Infinite | Pass / Fail |
1 | Infinite | Pass |
2 | Infinite | Pass |
3 | Infinite | Pass |
4 | Infinite | Pass |
Set the meter on diode test mode. Put the common lead on E terminal. Then touch the positive lead on each of the P terminals and record the readings. The resistance should be high.
Results for positive diode testing with positive lead on B | ||
No | Spec Infinite | Pass / Fail |
1 | Infinite | Pass |
2 | Infinite | Pass |
3 | Infinite | Pass |
4 | Infinite | Pass |
Results for negative diode testing with positive lead on E | ||
No | Spec 0.5 VD to 0.7 VD | Pass / Fail |
1 | .510 | Pass |
2 | .527 | Pass |
3 | .517 | Pass |
4 | .520 | Pass |
Locate the wiring diagram for regulator using following information on the regulator to identify the correct specifications. If the regulator number doesn't match any specified, use the most common set point voltage for the specification then wire to diagram test.
Regulator spec’s chart | |||
Part Number | M15 12600-0610 3K 08 | Yes / N/A | |
Field Setting | A | Checked | Yes /NA |
Voltage | 12 | Checked | Yes /NA |
Set Point Spec | 14.6 | Obtained | Yes /NA |
Now you have checked all the settings, have attained the set point voltage spec and understand how to use the regulator tester, continue to record your findings.
Regulator results chart | |||
Short Circuit Light | MUST BE OFF or turn off tester - OFF | Pass | |
Warning Light | Should come on and stay on - ON | Pass | |
Field Light | Should flash continuously - Flashy | Pass | |
Set Point voltage | Actual reading | 14.6 – 14.7 | Pass |
Common charging system wiring diagram and symbols
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