26-11-2013, 12:17 PM
Set the multi meter to 20v range and put the red onto + and the black onto -. While the engine is running the voltage should be 13.4-14.5v if the alternator is good. Any lower and it's bad. If it's reading good, turn your lights on and heater fan and read it again. It should cope with that without dropping below 13.4v at idle.
Current Car: Lexus CT200h 1.8 138, 2013, 19,500 miles
Previous Car: VW Passat 2.0 TDi 140, 2005, 136,000 miles
Previous Car: Peugeot 306 XLdt (stock!), 150,000 miles (I miss this car
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Previous Car: VW Passat 2.0 TDi 140, 2005, 136,000 miles
Previous Car: Peugeot 306 XLdt (stock!), 150,000 miles (I miss this car
)