Warning lights weird sound

measure the voltage while engine is running to check if the alternator is ok.
Engine on without any other electrics should be ~14V
and get lower with every electric device you turn on, but should always stay above 12V
 
OP
OP
M
measure the voltage while engine is running to check if the alternator is ok.
Engine on without any other electrics should be ~14V
and get lower with every electric device you turn on, but should always stay above 12V
Thanks for advice. How to check it safety? Disconnect plugs from alternator or just connect electric meter to battery?
 
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