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Noise from a generator may be due to electrical or mechanical noise. Electrical noise (magnetic whine) usually varies with the electrical load placed on the alternator and is a normal operating characteristic of all alternators. When diagnosing a noisy generator, it is important to remember that loose or misaligned components around the generator may transmit the noise into the passenger compartment and that replacing the generator may not solve the problem.
Step | Action | Yes | No | ||||
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1 | Test the alternator for proper operation using the Alternator Tester. Refer to Charging System Test . Is the alternator operating properly? | Go to Step 2 | Go to Step 11 | ||||
2 |
Has the noise stopped? | Go to Step 11 | Go to Step 3 | ||||
3 |
Does the alternator shaft spin smoothly and without any roughness or grinding noise? | Go to Step 4 | Go to Step 11 | ||||
4 | Inspect the alternator for a loose pulley and/or pulley nut. Is the alternator pulley or pulley nut loose? | Go to Step 11 | Go to Step 5 | ||||
5 |
Has the noise decreased or stopped? | System OK | Go to Step 6 | ||||
6 | Inspect the alternator for the following conditions:
Are any electrical connections pulling on the alternator or are any hoses, etc. resting on the alternator? | Go to Step 7 | Go to Step 8 | ||||
7 |
Has the noise decreased or stopped? | System OK | Go to Step 8 | ||||
8 | Inspect the drive belt for proper tension. Is the drive belt loose? | Go to Step 9 | Go to Step 10 | ||||
9 |
Has the noise decreased or stopped? | System OK | Go to Step 11 | ||||
10 | Compare the vehicle with a known good vehicle. Do both vehicles make the same noise? | System OK | Go to Step 11 | ||||
11 |
Important: If no definite alternator problems were found, be sure that all other possible sources of objectionable noise are eliminated before replacing the alternator. Replacing the alternator may not change the noise level if the noise is a normal characteristic of the alternator or the alternator mounting. Replace the alternator. Refer to Generator Replacement : LNQ → LF1 → LE5 . Has the noise decreased or stopped? | Go to Step 12 | - | ||||
12 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
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