Testing output on a Lucas ACR alternator- paul-ryan.info Use the car bodyas an earth. The three-pin plugaccomodates allthe alternatoroutput leads. Testeach connectionin turn.

The three-pin multiple plug has no earth terminal. Switch on the ignition and test the continuity of the leads one by one, by connecting them with the voltmeter to an earth. You should get a reading of battery voltage for each one; if not, there is a broken connection and the alternator cannot change the battery.

Appears in

Testing an alternator and checking output

Alternators have replaced dynamos as generators on modern cars; they can produce more current. A...