Car buying guide
Used car purchase inspection. alternator failure case
A Honda Civic used car inspection case study. The dealer claimed the vehicle repair were all done and even posted the repair photos on a major Korean used car platform. However, alternator was measured at12.69V. Trust but always verify, that is the best way in any used car inspection process.
Please follow the simple steps to check the alternator status.
First, connect the digital multi-meter (DMM) plus to the alternator b+ terminal (plus). Alligator clips are good for this purpose. Next, connect the minus of the DMM to the alternator case and then measure the voltage. measure
- Measure the voltage in the idle state after engine start. The voltage should be between 13.5V and 15.0V.
- At 3000 RPM, the voltage should not exceed 15.0.
Note: The above is for general 12V vehicles, and may not apply to 48V vehicles, BMS and other tuning vehicles.
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