Battery Connections Test

Turn ignition switch "OFF". Connect voltmeter positive lead to alternator's output terminal (B+). Ground negative lead. Note reading. Connect voltmeter positive lead to battery positive terminal, and negative lead to battery negative terminal. See Fig 1.

Fig 1: Checking Battery Connections with Voltmeter
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Readings should be identical in both tests .
Both readings should be the same. If voltage at alternator output terminal (B+) is lower than battery voltage, or if it fluctuates, check for broken wires, faulty connections or corroded terminals.