AR15.40-S-9301-02E | Test alternator diodes | ||
Warning | Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. |
Shown in connection scheme for model 447 |
030 | Engine tester with oscilloscope |
065 | DC clip-on probe |
G1 | On-board electrical system battery |
G2 | Alternator |
W10 | Battery ground point |
S15.40-4532-12
1 | Attach the DC clip-on probe (065) for the engine tester with oscilloscope (030) in accordance with the connection scheme to the positive line on the on-board electrical system battery (G1). |
2 | Start engine. |
3 | Switch on low beams. |
It is not possible in this test to assess the exciter diodes. |
4 | Assess diode harmonic content at an engine speed of 3000 rpm. |
5 | After ending checking, stop the engine. |
6 | Remove the DC clip-on probe (065) for the engine tester with oscilloscope (030). |
Shown without defect
Harmonics of the diodes are OK (an example).
Voltage peaks are possible but they are without meaning.
P15.40-0004-01
Shown: positive diode defective
One of the positive diodes is defective (an example).
P15.40-0003-01
Shown: negative diode defective
One of the negative diodes is defective (an example).
P15.40-0002-01
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