how to check alternator vauxhall cavalier diplomat 2.0i?

how to check my alternator as ithink it may be duff!
battery light and brake warning lights staying on
Kenny Lyell, February 2006


done
check it with a multimeter make sure its set to dc put red lead on the power terminal and black to earth you should get 13.5 v or 12.5 v with all lights and rear screen heater on if you dont it,s u/s

the best mechanic in uk, February 2006
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