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Testing output on a Lucas ACR alternator

Testing output on a Lucas ACR alternator Use the car body as an earth. The three-pin plug accomodates all the alternator output leads. Test each connection in 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.

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