Disconnect the lead from the battery negative terminal, then disconnect the leads from the top terminals of the voltage regulator located on the bulkhead within the engine compartment, ensuring to identify the leads for exact replacement to their original terminals. Unbolt the regulator and lift it far enough to disconnect the leads from its lower terminals. If the regulator unit is faulty, which can be tested by an auto-electrical company, renew it with one of the same type. Refitting is a reversal of removal.