On Car Testing: Notes
NOTE:
Alternator drive belt must be properly adjusted, battery and connections in good condition and charge warning bulb and circuit continuous in order to test charging system. Polarity of alternator and battery terminals MUST be observed to prevent system damage. Warm engine 3-4 minutes before testing. (Output may be slightly higher when alternator is cold.) Battery ground cable should be disconnected when attaching jumper wires to alternator and regulator.